diff --git a/src/core/article.cpp b/src/core/article.cpp
index 6309b32..6137549 100644
--- a/src/core/article.cpp
+++ b/src/core/article.cpp
@@ -11,18 +11,18 @@ void Article::setArticleNo(int articleNo) { m_articleNo = articleNo; }
 
 void Article::setPrice(int price) { m_price = price; }
 
-void Article::setDescription(const std::string& description) { m_description = description; }
+void Article::setDescription(const std::string &description) { m_description = description; }
 
-void Article::setSale(Sale* salePtr) { m_salePtr = salePtr; }
+void Article::setSale(Sale *salePtr) { m_salePtr = salePtr; }
 
-void Article::setSeller(Seller* sellerPtr) { m_sellerPtr = sellerPtr; }
+void Article::setSeller(Seller *sellerPtr) { m_sellerPtr = sellerPtr; }
 
 bool Article::isSold() { return m_salePtr ? true : false; }
 
 std::string Article::getDescription() { return m_description; }
 
-Seller* Article::getSeller() { return m_sellerPtr; }
-Sale* Article::getSale() { return m_salePtr; }
+Seller *Article::getSeller() { return m_sellerPtr; }
+Sale *Article::getSale() { return m_salePtr; }
 
 int Article::getPrice() const { return m_price; }
 
diff --git a/src/core/article.h b/src/core/article.h
index 30e7292..c9be086 100644
--- a/src/core/article.h
+++ b/src/core/article.h
@@ -11,30 +11,30 @@ class Sale;
 
 class Article : public EntityUuid
 {
-  public:
+public:
     Article() = default;
     Article(int price);
-    Article(const Article&) = delete;
+    Article(const Article &) = delete;
     virtual ~Article() = default;
 
     void setArticleNo(int articleNo);
     void setPrice(int price);
-    void setDescription(const std::string& description);
+    void setDescription(const std::string &description);
     bool isSold();
-    void setSale(Sale* salePtr);
-    void setSeller(Seller* sellerPtr);
+    void setSale(Sale *salePtr);
+    void setSeller(Seller *sellerPtr);
 
     int getArticleNo() const;
     std::string getCompleteArticleNo() const;
     std::string getDescription();
-    Seller* getSeller();
-    Sale* getSale();
+    Seller *getSeller();
+    Sale *getSale();
     int getPrice() const;
     std::string getPriceAsString() const;
 
-  private:
-    Seller* m_sellerPtr{};
-    Sale* m_salePtr{};
+private:
+    Seller *m_sellerPtr{};
+    Sale *m_salePtr{};
     int m_articleNo{};
     int m_price{};
     std::string m_description{};
diff --git a/src/core/csvreader.cpp b/src/core/csvreader.cpp
index 6c384f7..18a0a04 100644
--- a/src/core/csvreader.cpp
+++ b/src/core/csvreader.cpp
@@ -11,7 +11,7 @@
 
 namespace fs = std::filesystem;
 
-std::size_t CsvReader::readSellersFromFile(const fs::path& filePath, Marketplace* market)
+std::size_t CsvReader::readSellersFromFile(const fs::path &filePath, Marketplace *market)
 {
     csv::CSVFormat format;
     format.delimiter(';');
@@ -26,18 +26,18 @@ std::size_t CsvReader::readSellersFromFile(const fs::path& filePath, Marketplace
     csv::CSVReader csvReader(filePath.string(), format);
 #endif
 
-    for (auto& seller : market->getSellers()) {
+    for (auto &seller : market->getSellers()) {
         seller->setState(Seller::State::DELETE);
     }
 
     market->storeToDb(true);
-    
+
     int rowCount{};
     for (csv::CSVRow &row : csvReader) {
         if (!row[0].is_int()) {
             ++rowCount;
             continue;
-        } 
+        }
 
         if (row[2].get<std::string>().empty() && row[3].get<std::string>().empty()) {
             ++rowCount;
diff --git a/src/core/csvreader.h b/src/core/csvreader.h
index 1f9d924..ff1901a 100644
--- a/src/core/csvreader.h
+++ b/src/core/csvreader.h
@@ -11,9 +11,9 @@
 
 class CsvReader
 {
-  public:
-    static std::size_t readSellersFromFile(const std::filesystem::path& filePath,
-                                           Marketplace* market);
+public:
+    static std::size_t readSellersFromFile(const std::filesystem::path &filePath,
+                                           Marketplace *market);
 };
 
 #endif
\ No newline at end of file
diff --git a/src/core/database.cpp b/src/core/database.cpp
index 9d0df7d..f9ba43e 100644
--- a/src/core/database.cpp
+++ b/src/core/database.cpp
@@ -7,7 +7,7 @@
 
 #include "boost/date_time/posix_time/posix_time.hpp"
 
-Database::Database(const std::string& dbname)
+Database::Database(const std::string &dbname)
 {
     dbname_ = dbname;
     init();
@@ -28,7 +28,7 @@ Database::Database()
     if (!fs::exists(dbpath)) {
         try {
             fs::create_directories(dbpath);
-        } catch (fs::filesystem_error& err) {
+        } catch (fs::filesystem_error &err) {
             throw err;
         }
     }
@@ -57,9 +57,9 @@ void Database::newDb()
 
 Database::~Database() { sqlite3_close(db_); }
 
-void Database::exec(const std::string& sql)
+void Database::exec(const std::string &sql)
 {
-    char* errMsg;
+    char *errMsg;
     const int errCode = sqlite3_exec(db_, sql.c_str(), nullptr, nullptr, &errMsg);
     if (errCode) {
         std::string errMsgString(errMsg); // Make a C++ string of the errMsg, so that we can call
@@ -120,7 +120,7 @@ void Database::createNew()
     sqlStrings.push_back(sqlInitialEntries);
 
     beginTransaction();
-    for (const auto& sql : sqlStrings) {
+    for (const auto &sql : sqlStrings) {
         exec(sql);
     }
     endTransaction();
@@ -173,7 +173,7 @@ void Database::init()
 int Database::getVersion()
 {
     int retCode{};
-    sqlite3_stmt* stmt;
+    sqlite3_stmt *stmt;
 
     // Check if there's already a kima2 table available.
     // If not, return version == 0.
@@ -220,15 +220,15 @@ void Database::beginTransaction() { exec("BEGIN TRANSACTION"); }
 
 void Database::endTransaction() { exec("END TRANSACTION"); }
 
-unsigned int Database::storeSellers(std::vector<std::unique_ptr<Seller>>& sellers, bool onlyDelete)
+unsigned int Database::storeSellers(std::vector<std::unique_ptr<Seller>> &sellers, bool onlyDelete)
 {
     int retCode{};
     int count{};
-    sqlite3_stmt* stmt;
+    sqlite3_stmt *stmt;
 
     beginTransaction();
 
-    for (auto& seller : sellers) {
+    for (auto &seller : sellers) {
         if (seller->getState() == Seller::State::NEW && !onlyDelete) {
             retCode = sqlite3_prepare_v2(
                 db_,
@@ -323,12 +323,12 @@ unsigned int Database::storeSellers(std::vector<std::unique_ptr<Seller>>& seller
 
     // Everything went fine, so we can now update our objects
     sellers.erase(std::remove_if(sellers.begin(), sellers.end(),
-                                 [](const std::unique_ptr<Seller>& seller) {
+                                 [](const std::unique_ptr<Seller> &seller) {
                                      return (seller->getState() == Seller::State::DELETE);
                                  }),
                   sellers.end());
 
-    for (auto& seller : sellers) {
+    for (auto &seller : sellers) {
         seller->cleanupArticles();
         seller->setState(Seller::State::OK);
     }
@@ -336,13 +336,13 @@ unsigned int Database::storeSellers(std::vector<std::unique_ptr<Seller>>& seller
     return count;
 }
 
-unsigned int Database::storeArticles(std::vector<Article*> articles)
+unsigned int Database::storeArticles(std::vector<Article *> articles)
 {
     int retCode{};
     int count{};
-    sqlite3_stmt* stmt;
+    sqlite3_stmt *stmt;
 
-    for (auto& article : articles) {
+    for (auto &article : articles) {
         if (article->getState() == Article::State::NEW) {
             retCode = sqlite3_prepare_v2(
                 db_,
@@ -441,18 +441,18 @@ unsigned int Database::storeArticles(std::vector<Article*> articles)
     return count;
 }
 
-unsigned int Database::storeSales(std::vector<std::unique_ptr<Sale>>& sales)
+unsigned int Database::storeSales(std::vector<std::unique_ptr<Sale>> &sales)
 {
     int retCode{};
     int count{};
-    sqlite3_stmt* stmt;
+    sqlite3_stmt *stmt;
 
     if (sales.size() == 0)
         return 0;
 
     beginTransaction();
 
-    for (auto& sale : sales) {
+    for (auto &sale : sales) {
         if (sale->getState() == Sale::State::NEW) {
             retCode = sqlite3_prepare_v2(db_,
                                          "INSERT INTO sales"
@@ -482,7 +482,7 @@ unsigned int Database::storeSales(std::vector<std::unique_ptr<Sale>>& sales)
             ++count;
             sqlite3_finalize(stmt);
 
-            for (const auto& article : sale->getArticles()) {
+            for (const auto &article : sale->getArticles()) {
                 retCode = sqlite3_prepare_v2(db_,
                                              "INSERT INTO sales_items"
                                              " (sale_id, article_id)"
@@ -535,21 +535,21 @@ unsigned int Database::storeSales(std::vector<std::unique_ptr<Sale>>& sales)
     // Everything went fine, so we can now update our objects
     sales.erase(
         std::remove_if(sales.begin(), sales.end(),
-                       [](const auto& sale) { return (sale->getState() == Sale::State::DELETE); }),
+                       [](const auto &sale) { return (sale->getState() == Sale::State::DELETE); }),
         sales.end());
 
-    for (auto& sale : sales) {
+    for (auto &sale : sales) {
         sale->setState(Sale::State::OK);
     }
 
     return count;
 }
 
-unsigned int Database::loadSellers(std::vector<std::unique_ptr<Seller>>& sellers)
+unsigned int Database::loadSellers(std::vector<std::unique_ptr<Seller>> &sellers)
 {
     int retCode{};
     int count{};
-    sqlite3_stmt* stmt;
+    sqlite3_stmt *stmt;
 
     retCode = sqlite3_prepare_v2(db_,
                                  "SELECT seller_no, first_name, last_name, "
@@ -566,8 +566,8 @@ unsigned int Database::loadSellers(std::vector<std::unique_ptr<Seller>>& sellers
         ++count;
         auto seller = std::make_unique<Seller>();
         seller->setSellerNo(sqlite3_column_int(stmt, 0));
-        seller->setFirstName(reinterpret_cast<const char*>(sqlite3_column_text(stmt, 1)));
-        seller->setLastName(reinterpret_cast<const char*>(sqlite3_column_text(stmt, 2)));
+        seller->setFirstName(reinterpret_cast<const char *>(sqlite3_column_text(stmt, 1)));
+        seller->setLastName(reinterpret_cast<const char *>(sqlite3_column_text(stmt, 2)));
         seller->setNumArticlesOffered(sqlite3_column_int(stmt, 3));
         seller->setState(Seller::State::OK);
         sellers.push_back(std::move(seller));
@@ -577,7 +577,7 @@ unsigned int Database::loadSellers(std::vector<std::unique_ptr<Seller>>& sellers
 
     sqlite3_finalize(stmt);
 
-    for (auto& seller : sellers) {
+    for (auto &seller : sellers) {
         retCode = sqlite3_prepare_v2(db_,
                                      "SELECT id, source_no, article_no, description, price"
                                      " FROM articles"
@@ -594,11 +594,12 @@ unsigned int Database::loadSellers(std::vector<std::unique_ptr<Seller>>& sellers
         while (retCode != SQLITE_DONE) {
             ++count;
             auto article = std::make_unique<Article>();
-            article->setUuidFromString(reinterpret_cast<const char*>(sqlite3_column_text(stmt, 0)));
+            article->setUuidFromString(
+                reinterpret_cast<const char *>(sqlite3_column_text(stmt, 0)));
             article->setSeller(seller.get());
             article->setSourceNo(sqlite3_column_int(stmt, 1));
             article->setArticleNo(sqlite3_column_int(stmt, 2));
-            article->setDescription(reinterpret_cast<const char*>(sqlite3_column_text(stmt, 3)));
+            article->setDescription(reinterpret_cast<const char *>(sqlite3_column_text(stmt, 3)));
             article->setPrice(sqlite3_column_int(stmt, 4));
             article->setState(Article::State::OK);
 
@@ -613,12 +614,12 @@ unsigned int Database::loadSellers(std::vector<std::unique_ptr<Seller>>& sellers
     return count;
 }
 
-unsigned int Database::loadSales(std::vector<std::unique_ptr<Sale>>& sales,
-                                 std::vector<std::unique_ptr<Seller>>& sellers)
+unsigned int Database::loadSales(std::vector<std::unique_ptr<Sale>> &sales,
+                                 std::vector<std::unique_ptr<Seller>> &sellers)
 {
     int retCode{};
     int count{};
-    sqlite3_stmt* stmt;
+    sqlite3_stmt *stmt;
 
     retCode = sqlite3_prepare_v2(db_,
                                  "SELECT id, source_no, sold_at"
@@ -631,13 +632,13 @@ unsigned int Database::loadSales(std::vector<std::unique_ptr<Sale>>& sales,
 
     sales.clear();
 
-    std::map<std::string, Sale*> saleMap;
+    std::map<std::string, Sale *> saleMap;
     while (retCode != SQLITE_DONE) {
         ++count;
         auto sale = std::make_unique<Sale>();
-        sale->setUuidFromString(reinterpret_cast<const char*>(sqlite3_column_text(stmt, 0)));
+        sale->setUuidFromString(reinterpret_cast<const char *>(sqlite3_column_text(stmt, 0)));
         sale->setSourceNo(sqlite3_column_int(stmt, 1));
-        sale->setTimestamp(reinterpret_cast<const char*>(sqlite3_column_text(stmt, 2)));
+        sale->setTimestamp(reinterpret_cast<const char *>(sqlite3_column_text(stmt, 2)));
         sale->setState(Sale::State::OK);
         saleMap.insert(std::make_pair(sale->getUuidAsString(), sale.get()));
         sales.push_back(std::move(sale));
@@ -647,8 +648,8 @@ unsigned int Database::loadSales(std::vector<std::unique_ptr<Sale>>& sales,
 
     sqlite3_finalize(stmt);
 
-    std::map<std::string, Article*> artMap;
-    for (const auto& seller : sellers) {
+    std::map<std::string, Article *> artMap;
+    for (const auto &seller : sellers) {
         for (const auto article : seller->getArticles(false)) {
             artMap.insert(std::make_pair(article->getUuidAsString(), article));
         }
@@ -664,8 +665,8 @@ unsigned int Database::loadSales(std::vector<std::unique_ptr<Sale>>& sales,
     retCode = sqlite3_step(stmt);
 
     while (retCode != SQLITE_DONE) {
-        saleMap[reinterpret_cast<const char*>(sqlite3_column_text(stmt, 0))]->addArticle(
-            artMap[reinterpret_cast<const char*>(sqlite3_column_text(stmt, 1))]);
+        saleMap[reinterpret_cast<const char *>(sqlite3_column_text(stmt, 0))]->addArticle(
+            artMap[reinterpret_cast<const char *>(sqlite3_column_text(stmt, 1))]);
 
         retCode = sqlite3_step(stmt);
     }
@@ -678,7 +679,7 @@ unsigned int Database::loadSales(std::vector<std::unique_ptr<Sale>>& sales,
 void Database::updateCashPointNo(int oldCashPointNo, int newCashPointNo)
 {
     int retCode{};
-    sqlite3_stmt* stmt;
+    sqlite3_stmt *stmt;
 
     // Check if the new no ist already in use
     retCode = sqlite3_prepare_v2(db_, "SELECT COUNT() FROM articles WHERE source_no = :source_no",
diff --git a/src/core/database.h b/src/core/database.h
index 2cf1b63..af39f23 100644
--- a/src/core/database.h
+++ b/src/core/database.h
@@ -10,33 +10,33 @@
 
 class Database
 {
-  public:
-    enum class InitResult {OK, OUTDATED_REPLACED};
-    explicit Database(const std::string& dbname);
+public:
+    enum class InitResult { OK, OUTDATED_REPLACED };
+    explicit Database(const std::string &dbname);
     Database();
     ~Database();
-    Database(const Database&) = delete;
-    Database& operator=(const Database&) = delete;
-    void exec(const std::string& sql);
-    unsigned int storeSellers(std::vector<std::unique_ptr<Seller>>& sellers,
+    Database(const Database &) = delete;
+    Database &operator=(const Database &) = delete;
+    void exec(const std::string &sql);
+    unsigned int storeSellers(std::vector<std::unique_ptr<Seller>> &sellers,
                               bool onlyDelete = false);
-    unsigned int loadSellers(std::vector<std::unique_ptr<Seller>>& sellers);
-    unsigned int storeSales(std::vector<std::unique_ptr<Sale>>& sales);
-    unsigned int loadSales(std::vector<std::unique_ptr<Sale>>& sales,
-                           std::vector<std::unique_ptr<Seller>>& sellers);
+    unsigned int loadSellers(std::vector<std::unique_ptr<Seller>> &sellers);
+    unsigned int storeSales(std::vector<std::unique_ptr<Sale>> &sales);
+    unsigned int loadSales(std::vector<std::unique_ptr<Sale>> &sales,
+                           std::vector<std::unique_ptr<Seller>> &sellers);
     void updateCashPointNo(int oldCashPointNo, int newCashPointNo);
     void newDb();
-    InitResult getInitResult() {return initResult_;}
+    InitResult getInitResult() { return initResult_; }
 
-  private:
-    sqlite3* db_{nullptr};
+private:
+    sqlite3 *db_{nullptr};
     std::string dbname_;
     void init();
     void beginTransaction();
     void endTransaction();
     void createNew();
     int getVersion();
-    unsigned int storeArticles(std::vector<Article*> articles);
+    unsigned int storeArticles(std::vector<Article *> articles);
     void updateDbToVer2();
     void updateDbToVer3();
     InitResult initResult_{InitResult::OK};
diff --git a/src/core/entity.h b/src/core/entity.h
index 3517297..3b049ba 100644
--- a/src/core/entity.h
+++ b/src/core/entity.h
@@ -3,13 +3,13 @@
 
 class Entity
 {
-  public:
+public:
     enum class State { NEW, UPDATE, DELETE, OK };
     virtual ~Entity() = default;
     void setState(State state) { m_state = state; }
     virtual State getState() const;
 
-  private:
+private:
     State m_state{State::NEW};
 };
 
diff --git a/src/core/entityint.h b/src/core/entityint.h
index ea92937..82fac50 100644
--- a/src/core/entityint.h
+++ b/src/core/entityint.h
@@ -5,14 +5,14 @@
 
 class EntityInt : public Entity
 {
-  public:
+public:
     EntityInt() = default;
     virtual ~EntityInt() = default;
     EntityInt(int id);
     void setId(int id);
     int getId() const { return m_id; };
 
-  protected:
+protected:
     int m_id{};
 };
 
diff --git a/src/core/entityuuid.cpp b/src/core/entityuuid.cpp
index 7ae3163..eade2ac 100644
--- a/src/core/entityuuid.cpp
+++ b/src/core/entityuuid.cpp
@@ -11,7 +11,7 @@ void EntityUuid::createUuid()
     m_uuid = generator();
 }
 
-void EntityUuid::setUuidFromString(const std::string& uuidString)
+void EntityUuid::setUuidFromString(const std::string &uuidString)
 {
     boost::uuids::string_generator generator{};
     m_uuid = generator(uuidString);
diff --git a/src/core/entityuuid.h b/src/core/entityuuid.h
index bc6bf77..11b99d5 100644
--- a/src/core/entityuuid.h
+++ b/src/core/entityuuid.h
@@ -10,22 +10,22 @@
 
 class EntityUuid : public Entity
 {
-  public:
+public:
     EntityUuid() = default;
     virtual ~EntityUuid() = default;
 
     void createUuid();
-    void setUuidFromString(const std::string& uuidString);
+    void setUuidFromString(const std::string &uuidString);
     void setSourceNo(int sourceNo);
 
-    const boost::uuids::uuid& getUuid() const { return m_uuid; };
+    const boost::uuids::uuid &getUuid() const { return m_uuid; };
     std::string getUuidAsString() const { return boost::uuids::to_string(m_uuid); }
     virtual int getSourceNo() const;
 
-  protected:
+protected:
     int m_sourceNo{};
 
-  private:
+private:
     boost::uuids::uuid m_uuid{};
 };
 
diff --git a/src/core/excelreader.cpp b/src/core/excelreader.cpp
index 7c6abe2..82440ca 100644
--- a/src/core/excelreader.cpp
+++ b/src/core/excelreader.cpp
@@ -6,7 +6,7 @@
 
 namespace fs = std::filesystem;
 
-std::size_t ExcelReader::readSellersFromFile(const fs::path& filePath, Marketplace* market)
+std::size_t ExcelReader::readSellersFromFile(const fs::path &filePath, Marketplace *market)
 {
     xlnt::workbook wb;
     std::ifstream mystream(filePath, std::ios::binary);
@@ -15,7 +15,7 @@ std::size_t ExcelReader::readSellersFromFile(const fs::path& filePath, Marketpla
     }
     wb.load(mystream);
 
-    for (auto& seller : market->getSellers()) {
+    for (auto &seller : market->getSellers()) {
         seller->setState(Seller::State::DELETE);
     }
 
@@ -28,7 +28,7 @@ std::size_t ExcelReader::readSellersFromFile(const fs::path& filePath, Marketpla
             continue;
         }
 
-        //Skip the row if the seller has neither a first name nor a surname
+        // Skip the row if the seller has neither a first name nor a surname
         if (row[2].value<std::string>().empty() && row[3].value<std::string>().empty()) {
             continue;
         }
diff --git a/src/core/excelreader.h b/src/core/excelreader.h
index 62f06c4..1d2eefd 100644
--- a/src/core/excelreader.h
+++ b/src/core/excelreader.h
@@ -11,9 +11,9 @@
 
 class ExcelReader
 {
-  public:
-    static std::size_t readSellersFromFile(const std::filesystem::path& filePath,
-                                           Marketplace* market);
+public:
+    static std::size_t readSellersFromFile(const std::filesystem::path &filePath,
+                                           Marketplace *market);
 };
 
 #endif
\ No newline at end of file
diff --git a/src/core/jsonutil.cpp b/src/core/jsonutil.cpp
index 9a20603..bd24b4e 100644
--- a/src/core/jsonutil.cpp
+++ b/src/core/jsonutil.cpp
@@ -5,15 +5,14 @@
 
 #include <fstream>
 
-namespace fs = std::filesystem;
 using json = nlohmann::json;
 
-void JsonUtil::exportSellers(const std::filesystem::path& filePath, Marketplace* market)
+void JsonUtil::exportSellers(const std::filesystem::path &filePath, Marketplace *market)
 {
     json root;
     std::ofstream file(filePath);
 
-    for (const auto& seller : market->getSellers()) {
+    for (const auto &seller : market->getSellers()) {
         json newEntry;
         newEntry["seller_no"] = seller->getSellerNo();
         newEntry["last_name"] = seller->getLastName();
@@ -25,9 +24,9 @@ void JsonUtil::exportSellers(const std::filesystem::path& filePath, Marketplace*
     file << root.dump(4) << std::endl;
 }
 
-std::size_t JsonUtil::importSellers(const std::filesystem::path& filePath, Marketplace* market)
+std::size_t JsonUtil::importSellers(const std::filesystem::path &filePath, Marketplace *market)
 {
-    for (auto& seller : market->getSellers()) {
+    for (auto &seller : market->getSellers()) {
         seller->setState(Seller::State::DELETE);
     }
     market->storeToDb(true);
@@ -61,7 +60,7 @@ std::size_t JsonUtil::importSellers(const std::filesystem::path& filePath, Marke
     return market->getSellers().size() - 1; // minus 1 because we don't count the "special" seller
 }
 
-void JsonUtil::exportSales(const std::filesystem::path& filePath, Marketplace* market,
+void JsonUtil::exportSales(const std::filesystem::path &filePath, Marketplace *market,
                            int cashPointNo)
 {
     json root;
@@ -69,7 +68,7 @@ void JsonUtil::exportSales(const std::filesystem::path& filePath, Marketplace* m
 
     root["source_no"] = cashPointNo;
 
-    for (const auto& sale : market->getSales()) {
+    for (const auto &sale : market->getSales()) {
         if (sale->getSourceNo() != cashPointNo)
             continue;
 
@@ -77,7 +76,7 @@ void JsonUtil::exportSales(const std::filesystem::path& filePath, Marketplace* m
         newSale["uuid"] = sale->getUuidAsString();
         newSale["timestamp"] = sale->getTimestamp();
 
-        for (const auto& article : sale->getArticles()) {
+        for (const auto &article : sale->getArticles()) {
             json newArticle;
             newArticle["uuid"] = article->getUuidAsString();
             newArticle["seller_no"] = article->getSeller()->getSellerNo();
@@ -95,7 +94,7 @@ void JsonUtil::exportSales(const std::filesystem::path& filePath, Marketplace* m
     file << root.dump(4) << std::endl;
 }
 
-void JsonUtil::importSales(const std::filesystem::path& filePath, Marketplace* market,
+void JsonUtil::importSales(const std::filesystem::path &filePath, Marketplace *market,
                            int cashPointNo)
 {
     std::ifstream file(filePath);
@@ -110,12 +109,12 @@ void JsonUtil::importSales(const std::filesystem::path& filePath, Marketplace* m
     market->setSalesToDelete(jsonValues["source_no"]);
     market->storeToDb();
 
-    for (const auto& valSale : jsonValues["sales"]) {
+    for (const auto &valSale : jsonValues["sales"]) {
         auto sale = std::make_unique<Sale>();
         sale->setUuidFromString(valSale["uuid"]);
         sale->setSourceNo(jsonValues["source_no"]);
         sale->setTimestamp(valSale["timestamp"]);
-        for (const auto& valArticle : valSale["articles"]) {
+        for (const auto &valArticle : valSale["articles"]) {
             auto article = std::make_unique<Article>();
             article->setUuidFromString(valArticle["uuid"]);
             article->setSourceNo(jsonValues["source_no"]);
diff --git a/src/core/jsonutil.h b/src/core/jsonutil.h
index 2cc33a2..37190a0 100644
--- a/src/core/jsonutil.h
+++ b/src/core/jsonutil.h
@@ -8,12 +8,12 @@
 
 class JsonUtil
 {
-  public:
-    static void exportSellers(const std::filesystem::path& filePath, Marketplace* market);
-    static std::size_t importSellers(const std::filesystem::path& filePath, Marketplace* market);
-    static void exportSales(const std::filesystem::path& filePath, Marketplace* market,
+public:
+    static void exportSellers(const std::filesystem::path &filePath, Marketplace *market);
+    static std::size_t importSellers(const std::filesystem::path &filePath, Marketplace *market);
+    static void exportSales(const std::filesystem::path &filePath, Marketplace *market,
                             int cashPointNo);
-    static void importSales(const std::filesystem::path& filePath, Marketplace* market,
+    static void importSales(const std::filesystem::path &filePath, Marketplace *market,
                             int cashPointNo);
 };
 
diff --git a/src/core/marketplace.cpp b/src/core/marketplace.cpp
index 3fe234a..a68242b 100644
--- a/src/core/marketplace.cpp
+++ b/src/core/marketplace.cpp
@@ -33,15 +33,15 @@ Database::InitResult Marketplace::loadFromDb()
     return db.getInitResult();
 }
 
-SellersVec& Marketplace::getSellers() { return sellers_; }
+SellersVec &Marketplace::getSellers() { return sellers_; }
 
-SalesVec& Marketplace::getSales() { return sales_; }
+SalesVec &Marketplace::getSales() { return sales_; }
 
 int Marketplace::getNextSellerNo()
 {
     auto iter = std::max_element(
         sellers_.begin(), sellers_.end(),
-        [](const auto& a, const auto& b) -> bool { return a->getSellerNo() < b->getSellerNo(); });
+        [](const auto &a, const auto &b) -> bool { return a->getSellerNo() < b->getSellerNo(); });
     if (iter == sellers_.end())
         return 1;
     return (*iter)->getSellerNo() + 1;
@@ -53,14 +53,14 @@ int Marketplace::getNextArticleNo()
     int maxArtNoInBasket{0};
 
     auto iter = std::max_element(sellers_.begin(), sellers_.end(),
-                                 [](const auto& a, const auto& b) -> bool {
+                                 [](const auto &a, const auto &b) -> bool {
                                      return a->getMaxArticleNo() < b->getMaxArticleNo();
                                  });
     if (iter != sellers_.end())
         maxArtNoInDb = (*iter)->getMaxArticleNo();
 
     auto iter2 =
-        std::max_element(basket_.begin(), basket_.end(), [](const auto& a, const auto& b) -> bool {
+        std::max_element(basket_.begin(), basket_.end(), [](const auto &a, const auto &b) -> bool {
             return a->getArticleNo() < b->getArticleNo();
         });
 
@@ -73,13 +73,13 @@ int Marketplace::getNextArticleNo()
 int Marketplace::getNumSellersDelete()
 {
     int count = std::count_if(sellers_.begin(), sellers_.end(),
-                              [](const auto& a) { return a->getState() == Seller::State::DELETE; });
+                              [](const auto &a) { return a->getState() == Seller::State::DELETE; });
     return count;
 }
 
 int Marketplace::getNumArticlesSold()
 {
-    int sum = std::accumulate(sellers_.begin(), sellers_.end(), 0, [](int a, const auto& seller) {
+    int sum = std::accumulate(sellers_.begin(), sellers_.end(), 0, [](int a, const auto &seller) {
         return a + seller->numArticlesSold();
     });
     return sum;
@@ -87,7 +87,7 @@ int Marketplace::getNumArticlesSold()
 
 int Marketplace::getNumArticlesOffered()
 {
-    int sum = std::accumulate(sellers_.begin(), sellers_.end(), 0, [](int a, const auto& seller) {
+    int sum = std::accumulate(sellers_.begin(), sellers_.end(), 0, [](int a, const auto &seller) {
         return a + seller->numArticlesOffered();
     });
     return sum;
@@ -95,10 +95,10 @@ int Marketplace::getNumArticlesOffered()
 
 void Marketplace::sortSellers() { std::sort(sellers_.begin(), sellers_.end()); }
 
-Seller* Marketplace::findSellerWithSellerNo(int sellerNo)
+Seller *Marketplace::findSellerWithSellerNo(int sellerNo)
 {
     auto iter = std::find_if(sellers_.begin(), sellers_.end(),
-                             [sellerNo](const auto& a) { return a->getSellerNo() == sellerNo; });
+                             [sellerNo](const auto &a) { return a->getSellerNo() == sellerNo; });
     if (iter == sellers_.end())
         return nullptr;
     return (*iter).get();
@@ -129,12 +129,12 @@ void Marketplace::finishCurrentSale(std::unique_ptr<Sale> sale)
     storeToDb();
 }
 
-BasketVec& Marketplace::getBasket() { return basket_; }
+BasketVec &Marketplace::getBasket() { return basket_; }
 
 int Marketplace::getBasketSumInCent()
 {
     int sum = std::accumulate(basket_.begin(), basket_.end(), 0,
-                              [](int a, const auto& b) { return a + b->getPrice(); });
+                              [](int a, const auto &b) { return a + b->getPrice(); });
     return sum;
 }
 
@@ -148,23 +148,23 @@ std::string Marketplace::getBasketSumAsString()
 void Marketplace::removeSale(boost::uuids::uuid uuid)
 {
     sales_.erase(std::remove_if(sales_.begin(), sales_.end(),
-                                [&uuid](const auto& a) { return a->getUuid() == uuid; }),
+                                [&uuid](const auto &a) { return a->getUuid() == uuid; }),
                  sales_.end());
 }
 
 void Marketplace::setSalesToDelete(int cashPointNo)
 {
-    std::for_each(sales_.begin(), sales_.end(), [cashPointNo](auto& sale) {
+    std::for_each(sales_.begin(), sales_.end(), [cashPointNo](auto &sale) {
         if (sale->getSourceNo() == cashPointNo) {
             sale->setState(Sale::State::DELETE);
-            for (auto& article : sale->getArticles()) {
+            for (auto &article : sale->getArticles()) {
                 article->setState(Article::State::DELETE);
             }
         }
     });
 }
 
-void Marketplace::exportReportToCSV(const fs::path& filePath, int feeInPercent, int maxFeeInEuro)
+void Marketplace::exportReportToCSV(const fs::path &filePath, int feeInPercent, int maxFeeInEuro)
 {
     const char delimiter = ';';
     std::ofstream file(filePath);
@@ -173,7 +173,7 @@ void Marketplace::exportReportToCSV(const fs::path& filePath, int feeInPercent,
          << "Anz. gemeldet" << delimiter << "Anz. verkauft" << delimiter << "Umsatz" << delimiter
          << "Auszahlung\n";
 
-    for (const auto& seller : sellers_) {
+    for (const auto &seller : sellers_) {
         file << seller->getSellerNo() << delimiter
              << escapeCsvValue(seller->getLastName(), delimiter) << delimiter
              << escapeCsvValue(seller->getFirstName(), delimiter) << delimiter
@@ -189,7 +189,7 @@ void Marketplace::exportReportToCSV(const fs::path& filePath, int feeInPercent,
 int Marketplace::getOverallSumInCent()
 {
     int sum = std::accumulate(sellers_.begin(), sellers_.end(), 0,
-                              [](int a, const auto& b) { return a + b->sumInCents(); });
+                              [](int a, const auto &b) { return a + b->sumInCents(); });
     return sum;
 }
 
@@ -202,7 +202,7 @@ std::string Marketplace::getOverallSumAsString()
 int Marketplace::getOverallPaymentInCent(int percent, int maxFee)
 {
     int sum = std::accumulate(
-        sellers_.begin(), sellers_.end(), 0, [percent, maxFee](int a, const auto& b) {
+        sellers_.begin(), sellers_.end(), 0, [percent, maxFee](int a, const auto &b) {
             return a + b->sumInCents() - marketFee(b->sumInCents(), percent, maxFee);
         });
     return sum;
@@ -240,7 +240,7 @@ std::string paymentAsString(int sumInCent, int percent, int maxFeeInCent)
     return formatCentAsEuroString(sumInCent - marketFee(sumInCent, percent, maxFeeInCent));
 }
 
-std::string escapeCsvValue(const std::string& value, const char delimiter)
+std::string escapeCsvValue(const std::string &value, const char delimiter)
 {
     std::stringstream output;
     bool containsDelim{false};
@@ -250,7 +250,7 @@ std::string escapeCsvValue(const std::string& value, const char delimiter)
         output << '"';
     }
 
-    for (auto& symbol : value) {
+    for (auto &symbol : value) {
         if (symbol == '"') {
             output << '"' << symbol;
         } else {
diff --git a/src/core/marketplace.h b/src/core/marketplace.h
index fe45e02..71a7aa6 100644
--- a/src/core/marketplace.h
+++ b/src/core/marketplace.h
@@ -20,26 +20,26 @@ using BasketVec = std::vector<std::unique_ptr<Article>>;
 
 class Marketplace
 {
-  public:
+public:
     Marketplace();
 
     void storeToDb(bool onlyDelete = false);
     Database::InitResult loadFromDb();
 
-    SellersVec& getSellers();
-    SalesVec& getSales();
+    SellersVec &getSellers();
+    SalesVec &getSales();
     int getNextSellerNo();
     int getNextArticleNo();
     int getNumSellersDelete();
     int getNumArticlesSold();
     int getNumArticlesOffered();
-    BasketVec& getBasket();
+    BasketVec &getBasket();
     int getBasketSumInCent();
     std::string getBasketSumAsString();
 
     void sortSellers();
-    Seller* findSellerWithSellerNo(int sellerNo);
-    Seller* findSellerWithUuid(const std::string& uuid);
+    Seller *findSellerWithSellerNo(int sellerNo);
+    Seller *findSellerWithUuid(const std::string &uuid);
     void addArticleToBasket(std::unique_ptr<Article> article);
     size_t basketSize();
     void finishCurrentSale(std::unique_ptr<Sale> sale);
@@ -54,12 +54,12 @@ class Marketplace
 
     void clear();
 
-    void exportReportToCSV(const std::filesystem::path& filePath, int feeInPercent,
+    void exportReportToCSV(const std::filesystem::path &filePath, int feeInPercent,
                            int maxFeeInEuro);
 
     friend class ExcelReader;
 
-  private:
+private:
     SellersVec sellers_;
     SalesVec sales_;
     BasketVec basket_;
@@ -68,6 +68,6 @@ class Marketplace
 double marketFee(int sumInCent, int percent, int maxFeeInCent);
 std::string marketFeeAsString(int sumInCent, int percent, int maxFeeInCent);
 std::string paymentAsString(int sumInCent, int percent, int maxFeeInCent);
-std::string escapeCsvValue(const std::string& value, const char delimiter);
+std::string escapeCsvValue(const std::string &value, const char delimiter);
 
 #endif
diff --git a/src/core/sale.cpp b/src/core/sale.cpp
index 1fce577..60e041a 100644
--- a/src/core/sale.cpp
+++ b/src/core/sale.cpp
@@ -3,41 +3,41 @@
 
 #include <numeric>
 
-void Sale::addArticle(Article* articlePtr)
+void Sale::addArticle(Article *articlePtr)
 {
     articlePtr->setSale(this);
-    articles_.push_back(articlePtr);
+    m_articles.push_back(articlePtr);
 }
 
-ArticlesVec& Sale::getArticles() { return articles_; }
+ArticlesVec &Sale::getArticles() { return m_articles; }
 
-void Sale::removeArticle(const Article* articlePtr)
+void Sale::removeArticle(const Article *articlePtr)
 {
-    auto it = std::find(articles_.begin(), articles_.end(), articlePtr);
+    auto it = std::find(m_articles.begin(), m_articles.end(), articlePtr);
 
-    if (it != articles_.end()) {
+    if (it != m_articles.end()) {
         (*it)->setSale(nullptr);
         (*it)->setState(
             Article::State::DELETE); // since we only have ad-hoc articles, that have all been sold
-        articles_.erase(it);
+        m_articles.erase(it);
     }
 }
 
 int Sale::sumInCents()
 {
-    int sum = std::accumulate(articles_.begin(), articles_.end(), 0,
-                              [](int a, const Article* b) { return a + b->getPrice(); });
+    int sum = std::accumulate(m_articles.begin(), m_articles.end(), 0,
+                              [](int a, const Article *b) { return a + b->getPrice(); });
     return sum;
 }
 
 std::string Sale::sumAsString() { return formatCentAsEuroString(sumInCents()); }
 
-std::string Sale::getTimestamp() const { return timestamp_; }
+std::string Sale::getTimestamp() const { return m_timestamp; }
 
-void Sale::setTimestamp(const std::string& timestamp) { timestamp_ = timestamp; }
+void Sale::setTimestamp(const std::string &timestamp) { m_timestamp = timestamp; }
 
 std::string Sale::getTimestampFormatted() const
 {
-    boost::posix_time::ptime time = boost::posix_time::from_iso_extended_string(timestamp_);
+    boost::posix_time::ptime time = boost::posix_time::from_iso_extended_string(m_timestamp);
     return boost::posix_time::to_simple_string(time);
 }
diff --git a/src/core/sale.h b/src/core/sale.h
index 02a960d..dd54f58 100644
--- a/src/core/sale.h
+++ b/src/core/sale.h
@@ -11,30 +11,30 @@
 
 namespace
 {
-using ArticlesVec = std::vector<Article*>;
+using ArticlesVec = std::vector<Article *>;
 }
 
 class Sale : public EntityUuid
 {
-  public:
+public:
     Sale() = default;
-    Sale(const Sale&) = delete;
+    Sale(const Sale &) = delete;
     virtual ~Sale() = default;
-    void addArticle(Article* articlePtr);
-    void setTimestamp(const std::string& timestamp);
+    void addArticle(Article *articlePtr);
+    void setTimestamp(const std::string &timestamp);
 
-    ArticlesVec& getArticles();
+    ArticlesVec &getArticles();
     std::string getTimestamp() const;
     std::string getTimestampFormatted() const;
     int sumInCents();
     std::string sumAsString();
 
-    void removeArticle(const Article* articlePtr);
+    void removeArticle(const Article *articlePtr);
 
-  private:
-    std::string timestamp_{
+private:
+    std::string m_timestamp{
         boost::posix_time::to_iso_extended_string(boost::posix_time::second_clock::local_time())};
-    mutable ArticlesVec articles_{};
+    mutable ArticlesVec m_articles{};
 };
 
 #endif
diff --git a/src/core/seller.cpp b/src/core/seller.cpp
index e5de07d..9cbb88d 100644
--- a/src/core/seller.cpp
+++ b/src/core/seller.cpp
@@ -5,32 +5,32 @@
 #include <numeric>
 #include <sstream>
 
-Seller::Seller(const std::string& firstName, const std::string& lastName, int sellerNo,
+Seller::Seller(const std::string &firstName, const std::string &lastName, int sellerNo,
                int numArticlesOffered)
     : EntityInt(sellerNo)
 {
-    firstName_ = firstName;
-    lastName_ = lastName;
-    numArticlesOffered_ = numArticlesOffered;
+    m_firstName = firstName;
+    m_lastName = lastName;
+    m_numArticlesOffered = numArticlesOffered;
 }
 
 void Seller::setSellerNo(int seller_no) { setId(seller_no); }
 
-void Seller::setFirstName(const std::string& firstName) { firstName_ = firstName; }
+void Seller::setFirstName(const std::string &firstName) { m_firstName = firstName; }
 
-void Seller::setLastName(const std::string& lastName) { lastName_ = lastName; }
+void Seller::setLastName(const std::string &lastName) { m_lastName = lastName; }
 
-void Seller::setNumArticlesOffered(int number) { numArticlesOffered_ = number; }
+void Seller::setNumArticlesOffered(int number) { m_numArticlesOffered = number; }
 
 void Seller::addArticle(std::unique_ptr<Article> article)
 {
     article->setSeller(this);
-    articles_.push_back(std::move(article));
+    m_articles.push_back(std::move(article));
 }
 
-std::string Seller::getFirstName() const { return firstName_; }
+std::string Seller::getFirstName() const { return m_firstName; }
 
-std::string Seller::getLastName() const { return lastName_; }
+std::string Seller::getLastName() const { return m_lastName; }
 
 int Seller::getSellerNo() const { return getId(); }
 
@@ -44,10 +44,10 @@ std::string Seller::getSellerNoAsString() const
     ;
 }
 
-std::vector<Article*> Seller::getArticles(bool onlySold) const
+std::vector<Article *> Seller::getArticles(bool onlySold) const
 {
-    std::vector<Article*> articles;
-    for (const auto& article : articles_) {
+    std::vector<Article *> articles;
+    for (const auto &article : m_articles) {
         if (onlySold && article->isSold()) {
             articles.push_back(article.get());
         } else if (!onlySold) {
@@ -57,54 +57,54 @@ std::vector<Article*> Seller::getArticles(bool onlySold) const
     return articles;
 }
 
-Article* Seller::getArticleByUuid(const std::string& uuidString)
+Article *Seller::getArticleByUuid(const std::string &uuidString)
 {
-    auto iter = std::find_if(articles_.begin(), articles_.end(), [&uuidString](const auto& art) {
+    auto iter = std::find_if(m_articles.begin(), m_articles.end(), [&uuidString](const auto &art) {
         return art->getUuidAsString() == uuidString;
     });
-    if (iter == articles_.end())
+    if (iter == m_articles.end())
         return nullptr;
     return (*iter).get();
 }
 
 int Seller::numArticlesSold() const { return static_cast<int>(getArticles(true).size()); }
 
-int Seller::numArticlesOffered() const { return numArticlesOffered_; }
+int Seller::numArticlesOffered() const { return m_numArticlesOffered; }
 
 int Seller::getMaxArticleNo() const
 {
     auto iter = std::max_element(
-        articles_.begin(), articles_.end(),
-        [](const auto& a, const auto& b) -> bool { return a->getArticleNo() < b->getArticleNo(); });
-    if (iter == articles_.end())
+        m_articles.begin(), m_articles.end(),
+        [](const auto &a, const auto &b) -> bool { return a->getArticleNo() < b->getArticleNo(); });
+    if (iter == m_articles.end())
         return 0;
     return (*iter)->getArticleNo();
 }
 
 void Seller::cleanupArticles()
 {
-    articles_.erase(std::remove_if(articles_.begin(), articles_.end(),
-                                   [](const auto& article) {
+    m_articles.erase(std::remove_if(m_articles.begin(), m_articles.end(),
+                                   [](const auto &article) {
                                        return article->getState() == Article::State::DELETE;
                                    }),
-                    articles_.end());
+                    m_articles.end());
 
-    for (auto& article : articles_) {
+    for (auto &article : m_articles) {
         article->setState(Article::State::OK);
     }
 }
 
 int Seller::sumInCents()
 {
-    int sum = std::accumulate(articles_.begin(), articles_.end(), 0,
-                              [](int a, const auto& b) { return a + b->getPrice(); });
+    int sum = std::accumulate(m_articles.begin(), m_articles.end(), 0,
+                              [](int a, const auto &b) { return a + b->getPrice(); });
     return sum;
 }
 
 std::string Seller::sumAsString() { return formatCentAsEuroString(sumInCents()); }
 
-bool operator<(const Seller& li, const Seller& re) { return li.m_id < re.m_id; }
-bool operator<(const std::unique_ptr<Seller>& li, const std::unique_ptr<Seller>& re)
+bool operator<(const Seller &li, const Seller &re) { return li.m_id < re.m_id; }
+bool operator<(const std::unique_ptr<Seller> &li, const std::unique_ptr<Seller> &re)
 {
     return li->m_id < re->m_id;
 }
diff --git a/src/core/seller.h b/src/core/seller.h
index e3dda18..f71b1eb 100644
--- a/src/core/seller.h
+++ b/src/core/seller.h
@@ -12,16 +12,16 @@
 
 class Seller : public EntityInt
 {
-  public:
+public:
     Seller() = default;
-    Seller(const Seller&) = delete;
+    Seller(const Seller &) = delete;
     virtual ~Seller() = default;
-    Seller(const std::string& firstName, const std::string& lastName, int sellerNo = 0,
+    Seller(const std::string &firstName, const std::string &lastName, int sellerNo = 0,
            int numArticlesOffered = 0);
 
     void setSellerNo(int sellerNo);
-    void setFirstName(const std::string& firstName);
-    void setLastName(const std::string& lastName);
+    void setFirstName(const std::string &firstName);
+    void setLastName(const std::string &lastName);
     void setNumArticlesOffered(int number);
     void addArticle(std::unique_ptr<Article> article);
     void cleanupArticles();
@@ -32,20 +32,20 @@ class Seller : public EntityInt
     std::string getSellerNoAsString() const;
     int numArticlesOffered() const;
     int numArticlesSold() const;
-    std::vector<Article*> getArticles(bool onlySold = true) const;
-    Article* getArticleByUuid(const std::string& uuidString);
+    std::vector<Article *> getArticles(bool onlySold = true) const;
+    Article *getArticleByUuid(const std::string &uuidString);
     int getMaxArticleNo() const;
     int sumInCents();
     std::string sumAsString();
 
-    friend bool operator<(const Seller& li, const Seller& re);
-    friend bool operator<(const std::unique_ptr<Seller>& li, const std::unique_ptr<Seller>& re);
+    friend bool operator<(const Seller &li, const Seller &re);
+    friend bool operator<(const std::unique_ptr<Seller> &li, const std::unique_ptr<Seller> &re);
 
-  private:
-    int numArticlesOffered_{};
-    std::string firstName_{};
-    std::string lastName_{};
-    std::vector<std::unique_ptr<Article>> articles_{};
+private:
+    int m_numArticlesOffered{};
+    std::string m_firstName{};
+    std::string m_lastName{};
+    std::vector<std::unique_ptr<Article>> m_articles{};
 };
 
 #endif
diff --git a/src/core/utils.cpp b/src/core/utils.cpp
index 83c7a3a..58985ef 100644
--- a/src/core/utils.cpp
+++ b/src/core/utils.cpp
@@ -13,7 +13,7 @@ std::string formatCentAsEuroString(const int cent, int width)
         currStream.imbue(myLocale);
         currStream << std::right << std::setw(width) << std::showbase
                    << std::put_money(cent, false);
-    } catch (std::runtime_error& err) {
+    } catch (std::runtime_error &err) {
         currStream << std::fixed << std::setw(width >= 4 ? width - 4 : width)
                    << std::setprecision(2) << cent / 100.0L << " €";
     }
@@ -21,19 +21,19 @@ std::string formatCentAsEuroString(const int cent, int width)
     return currStream.str();
 }
 
-std::string& ltrim(std::string& str, const std::string& chars)
+std::string &ltrim(std::string &str, const std::string &chars)
 {
     str.erase(0, str.find_first_not_of(chars));
     return str;
 }
 
-std::string& rtrim(std::string& str, const std::string& chars)
+std::string &rtrim(std::string &str, const std::string &chars)
 {
     str.erase(str.find_last_not_of(chars) + 1);
     return str;
 }
 
-std::string& trim(std::string& str, const std::string& chars)
+std::string &trim(std::string &str, const std::string &chars)
 {
     return ltrim(rtrim(str, chars), chars);
 }
diff --git a/src/core/utils.h b/src/core/utils.h
index 9ca2d32..36790d2 100644
--- a/src/core/utils.h
+++ b/src/core/utils.h
@@ -6,9 +6,9 @@
 #include <string>
 
 std::string formatCentAsEuroString(const int cent, int width = 10);
-std::string& ltrim(std::string& str, const std::string& chars = "\t\n\v\f\r ");
-std::string& rtrim(std::string& str, const std::string& chars = "\t\n\v\f\r ");
-std::string& trim(std::string& str, const std::string& chars = "\t\n\v\f\r ");
+std::string &ltrim(std::string &str, const std::string &chars = "\t\n\v\f\r ");
+std::string &rtrim(std::string &str, const std::string &chars = "\t\n\v\f\r ");
+std::string &trim(std::string &str, const std::string &chars = "\t\n\v\f\r ");
 bool case_insensitive_match(std::string s1, std::string s2);
 
 #endif
diff --git a/src/gui/reportdialog.cpp b/src/gui/reportdialog.cpp
index 02717aa..4ec1f8b 100644
--- a/src/gui/reportdialog.cpp
+++ b/src/gui/reportdialog.cpp
@@ -17,10 +17,10 @@
 
 namespace fs = std::filesystem;
 
-ReportDialog::ReportDialog(QWidget* parent, Qt::WindowFlags f) : QDialog(parent, f)
+ReportDialog::ReportDialog(QWidget *parent, Qt::WindowFlags f) : QDialog(parent, f)
 {
     ui_.setupUi(this);
-    market_ = dynamic_cast<MainWindow*>(parent)->getMarketplace();
+    market_ = dynamic_cast<MainWindow *>(parent)->getMarketplace();
     model_ = std::make_unique<ReportModel>(market_, ui_.reportView);
     ui_.reportView->setModel(model_.get());
     ui_.reportView->hideColumn(0);
@@ -76,7 +76,7 @@ void ReportDialog::onPrintReportButtonClicked()
     int height = printer.height();
     int width = printer.width();
     const double ENTRIES_PER_PAGE = 51;
-    const auto& sellers = market_->getSellers();
+    const auto &sellers = market_->getSellers();
     unsigned int numPages = std::ceil(sellers.size() / ENTRIES_PER_PAGE);
 
     painter.begin(&printer);
@@ -136,7 +136,7 @@ void ReportDialog::onPrintReportButtonClicked()
         QString content("Einzelteile ohne Nummer\n=======================\n\n");
         unsigned int lines{0};
         unsigned int pages{1};
-        for (const auto& article : specialSeller->getArticles(true)) {
+        for (const auto &article : specialSeller->getArticles(true)) {
             content += QString("- %1:").arg(article->getDescription().substr(0, 45).c_str(), -45);
             content += QString("%1\n").arg(article->getPriceAsString().c_str(), 11);
             ++lines;
@@ -201,7 +201,7 @@ void ReportDialog::onPrintSellerReceiptButtonClicked()
         return;
 
     auto indexes = selModel->selectedRows();
-    auto& seller = market_->getSellers().at(indexes[0].row());
+    auto &seller = market_->getSellers().at(indexes[0].row());
 
     auto printerDevice =
         convertToPosPrinterDevice(posPrinterDevice.toStdString(), posPrinterEndpoint.toStdString());
@@ -220,8 +220,8 @@ void ReportDialog::onPrintSellerReceiptButtonClicked()
             settings.value("global/commune", "Dettingen").toString().toStdString());
 }
 
-void ReportDialog::onReportViewSelectionChanged(const QItemSelection& selected,
-                                                [[maybe_unused]] const QItemSelection& deselected)
+void ReportDialog::onReportViewSelectionChanged(const QItemSelection &selected,
+                                                [[maybe_unused]] const QItemSelection &deselected)
 {
     if (selected.size() > 0) {
         ui_.printSellerReceiptButton->setEnabled(true);