diff --git a/src/core/article.cpp b/src/core/article.cpp
index 0715d93..3de88de 100644
--- a/src/core/article.cpp
+++ b/src/core/article.cpp
@@ -4,12 +4,8 @@
 #include <iomanip>
 #include <sstream>
 
-// Article::Article() : Entity() {}
-
 Article::Article(int price) : price_(price) {}
 
-// Article::Article(std::shared_ptr<Seller> sellerPtr) : Entity() { sellerPtr_ = sellerPtr; }
-
 void Article::setArticleNo(int articleNo) { articleNo_ = articleNo; }
 
 void Article::setPrice(int price) { price_ = price; }
@@ -29,10 +25,7 @@ Sale* Article::getSale() { return salePtr_; }
 
 int Article::getPrice() const { return price_; }
 
-std::string Article::getPriceAsString() const
-{
-    return formatCentAsEuroString(price_);
-}
+std::string Article::getPriceAsString() const { return formatCentAsEuroString(price_); }
 
 int Article::getArticleNo() const { return articleNo_; }
 
diff --git a/src/core/csvreader.h b/src/core/csvreader.h
index 4c88551..1f9d924 100644
--- a/src/core/csvreader.h
+++ b/src/core/csvreader.h
@@ -12,7 +12,8 @@
 class CsvReader
 {
   public:
-    static std::size_t readSellersFromFile(const std::filesystem::path& filePath, Marketplace* market);
+    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 f95deae..9d0df7d 100644
--- a/src/core/database.cpp
+++ b/src/core/database.cpp
@@ -136,10 +136,7 @@ void Database::updateDbToVer2()
     endTransaction();
 }
 
-void Database::updateDbToVer3()
-{
-    newDb();
-}
+void Database::updateDbToVer3() { newDb(); }
 
 void Database::init()
 {
@@ -274,8 +271,7 @@ unsigned int Database::storeSellers(std::vector<std::unique_ptr<Seller>>& seller
             if (retCode != SQLITE_OK)
                 throw std::runtime_error(sqlite3_errmsg(db_));
 
-            sqlite3_bind_int(stmt, sqlite3_bind_parameter_index(stmt, ":id"),
-                              seller->getId());
+            sqlite3_bind_int(stmt, sqlite3_bind_parameter_index(stmt, ":id"), seller->getId());
             sqlite3_bind_int(stmt, sqlite3_bind_parameter_index(stmt, ":seller_no"),
                              seller->getSellerNo());
             sqlite3_bind_text(stmt, sqlite3_bind_parameter_index(stmt, ":first_name"),
@@ -298,14 +294,13 @@ unsigned int Database::storeSellers(std::vector<std::unique_ptr<Seller>>& seller
         } else if (seller->getState() == Seller::State::DELETE) {
             count += static_cast<int>(seller->getArticles(false).size());
 
-            retCode =
-                sqlite3_prepare_v2(db_, "DELETE FROM sellers WHERE seller_no = :id", -1, &stmt, nullptr);
+            retCode = sqlite3_prepare_v2(db_, "DELETE FROM sellers WHERE seller_no = :id", -1,
+                                         &stmt, nullptr);
 
             if (retCode != SQLITE_OK)
                 throw std::runtime_error(sqlite3_errmsg(db_));
 
-            sqlite3_bind_int(stmt, sqlite3_bind_parameter_index(stmt, ":id"),
-                              seller->getId());
+            sqlite3_bind_int(stmt, sqlite3_bind_parameter_index(stmt, ":id"), seller->getId());
 
             retCode = sqlite3_step(stmt);
 
@@ -363,7 +358,7 @@ unsigned int Database::storeArticles(std::vector<Article*> articles)
                               boost::uuids::to_string(article->getUuid()).c_str(), -1,
                               SQLITE_TRANSIENT);
             sqlite3_bind_int(stmt, sqlite3_bind_parameter_index(stmt, ":seller_id"),
-                              article->getSeller()->getId());
+                             article->getSeller()->getId());
             sqlite3_bind_int(stmt, sqlite3_bind_parameter_index(stmt, ":source_no"),
                              article->getSourceNo());
             sqlite3_bind_int(stmt, sqlite3_bind_parameter_index(stmt, ":article_no"),
@@ -399,7 +394,7 @@ unsigned int Database::storeArticles(std::vector<Article*> articles)
                               boost::uuids::to_string(article->getUuid()).c_str(), -1,
                               SQLITE_TRANSIENT);
             sqlite3_bind_int(stmt, sqlite3_bind_parameter_index(stmt, ":seller_id"),
-                              article->getSeller()->getId());
+                             article->getSeller()->getId());
             sqlite3_bind_int(stmt, sqlite3_bind_parameter_index(stmt, ":source_no"),
                              article->getSourceNo());
             sqlite3_bind_int(stmt, sqlite3_bind_parameter_index(stmt, ":article_no"),
@@ -592,8 +587,7 @@ unsigned int Database::loadSellers(std::vector<std::unique_ptr<Seller>>& sellers
         if (retCode != SQLITE_OK)
             throw std::runtime_error(sqlite3_errmsg(db_));
 
-        sqlite3_bind_int(stmt, sqlite3_bind_parameter_index(stmt, ":seller_id"),
-                          seller->getId());
+        sqlite3_bind_int(stmt, sqlite3_bind_parameter_index(stmt, ":seller_id"), seller->getId());
 
         retCode = sqlite3_step(stmt);
 
diff --git a/src/core/entity.h b/src/core/entity.h
index ca48f47..a0eb97c 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) { state_ = state; }
     virtual State getState() const;
 
-private:
+  private:
     State state_{State::NEW};
 };
 
diff --git a/src/core/entityint.cpp b/src/core/entityint.cpp
index 835c5ff..28e210e 100644
--- a/src/core/entityint.cpp
+++ b/src/core/entityint.cpp
@@ -1,9 +1,5 @@
 #include "entityint.h"
 
-EntityInt::EntityInt(int id) {
-    id_ = id;
-}
+EntityInt::EntityInt(int id) { id_ = id; }
 
-void EntityInt::setId(int id) {
-    id_ = id;
-}
+void EntityInt::setId(int id) { id_ = id; }
diff --git a/src/core/entityuuid.cpp b/src/core/entityuuid.cpp
index 07eaf8d..570c624 100644
--- a/src/core/entityuuid.cpp
+++ b/src/core/entityuuid.cpp
@@ -17,11 +17,6 @@ void EntityUuid::setUuidFromString(const std::string& uuidString)
     uuid_ = generator(uuidString);
 }
 
+void EntityUuid::setSourceNo(int sourceNo) { sourceNo_ = sourceNo; }
 
-void EntityUuid::setSourceNo(int sourceNo) {
-    sourceNo_ = sourceNo;
-}
-
-int EntityUuid::getSourceNo() const {
-    return sourceNo_;
-}
+int EntityUuid::getSourceNo() const { return sourceNo_; }
diff --git a/src/core/excelreader.h b/src/core/excelreader.h
index b9d0e1c..62f06c4 100644
--- a/src/core/excelreader.h
+++ b/src/core/excelreader.h
@@ -12,7 +12,8 @@
 class ExcelReader
 {
   public:
-    static std::size_t readSellersFromFile(const std::filesystem::path& filePath, Marketplace* market);
+    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 dc7e4dc..9a20603 100644
--- a/src/core/jsonutil.cpp
+++ b/src/core/jsonutil.cpp
@@ -61,7 +61,8 @@ 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, int cashPointNo)
+void JsonUtil::exportSales(const std::filesystem::path& filePath, Marketplace* market,
+                           int cashPointNo)
 {
     json root;
     std::ofstream file(filePath);
@@ -94,7 +95,8 @@ 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, int cashPointNo)
+void JsonUtil::importSales(const std::filesystem::path& filePath, Marketplace* market,
+                           int cashPointNo)
 {
     std::ifstream file(filePath);
     json jsonValues = json::parse(file);
diff --git a/src/core/jsonutil.h b/src/core/jsonutil.h
index 4d06ace..2cc33a2 100644
--- a/src/core/jsonutil.h
+++ b/src/core/jsonutil.h
@@ -3,16 +3,18 @@
 
 #include "marketplace.h"
 
-#include <string>
 #include <filesystem>
+#include <string>
 
 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, int cashPointNo);
-    static void importSales(const std::filesystem::path& filePath, Marketplace* market, int cashPointNo);
+    static void exportSales(const std::filesystem::path& filePath, Marketplace* market,
+                            int cashPointNo);
+    static void importSales(const std::filesystem::path& filePath, Marketplace* market,
+                            int cashPointNo);
 };
 
 #endif
\ No newline at end of file
diff --git a/src/core/marketplace.cpp b/src/core/marketplace.cpp
index c9f4b7a..3fe234a 100644
--- a/src/core/marketplace.cpp
+++ b/src/core/marketplace.cpp
@@ -3,11 +3,11 @@
 #include "utils.h"
 
 #include <algorithm>
+#include <filesystem>
 #include <fstream>
 #include <iomanip>
 #include <numeric>
 #include <sstream>
-#include <filesystem>
 
 namespace fs = std::filesystem;
 
@@ -104,20 +104,10 @@ Seller* Marketplace::findSellerWithSellerNo(int sellerNo)
     return (*iter).get();
 }
 
-/*
-Seller* Marketplace::findSellerWithUuid(const std::string& uuid)
-{
-    auto iter = std::find_if(sellers_.begin(), sellers_.end(),
-                             [uuid](const auto& a) { return a->getUuidAsString() == uuid; });
-    if (iter == sellers_.end())
-        return nullptr;
-    return (*iter).get();
-}
-*/
-
 void Marketplace::addArticleToBasket(std::unique_ptr<Article> article)
 {
-    basket_.insert(basket_.begin(), std::move(article)); // article to the beginning of the basket vector
+    basket_.insert(basket_.begin(),
+                   std::move(article)); // article to the beginning of the basket vector
 }
 
 size_t Marketplace::basketSize() { return basket_.size(); }
@@ -189,8 +179,9 @@ void Marketplace::exportReportToCSV(const fs::path& filePath, int feeInPercent,
              << escapeCsvValue(seller->getFirstName(), delimiter) << delimiter
              << seller->numArticlesOffered() << delimiter << seller->numArticlesSold() << delimiter
              << escapeCsvValue(seller->sumAsString(), delimiter) << delimiter
-             << escapeCsvValue(paymentAsString(seller->sumInCents(), feeInPercent, maxFeeInEuro * 100),
-                               delimiter)
+             << escapeCsvValue(
+                    paymentAsString(seller->sumInCents(), feeInPercent, maxFeeInEuro * 100),
+                    delimiter)
              << "\n";
     }
 }
diff --git a/src/core/marketplace.h b/src/core/marketplace.h
index 47e25bd..fe45e02 100644
--- a/src/core/marketplace.h
+++ b/src/core/marketplace.h
@@ -1,8 +1,8 @@
 #ifndef MARKETPLACE_H
 #define MARKETPLACE_H
 
-#include "database.h"
 #include "article.h"
+#include "database.h"
 #include "sale.h"
 #include "seller.h"
 
diff --git a/src/core/sale.cpp b/src/core/sale.cpp
index ae3f143..1fce577 100644
--- a/src/core/sale.cpp
+++ b/src/core/sale.cpp
@@ -13,8 +13,6 @@ ArticlesVec& Sale::getArticles() { return articles_; }
 
 void Sale::removeArticle(const Article* articlePtr)
 {
-    /* auto it = std::find_if(articles_.begin(), articles_.end(),
-                               [&articlePtr](auto art) { return art.get() == articlePtr; }); */
     auto it = std::find(articles_.begin(), articles_.end(), articlePtr);
 
     if (it != articles_.end()) {
diff --git a/src/core/seller.h b/src/core/seller.h
index 0c6dd38..e3dda18 100644
--- a/src/core/seller.h
+++ b/src/core/seller.h
@@ -32,7 +32,6 @@ class Seller : public EntityInt
     std::string getSellerNoAsString() const;
     int numArticlesOffered() const;
     int numArticlesSold() const;
-    // int numArticlesTotal() const;
     std::vector<Article*> getArticles(bool onlySold = true) const;
     Article* getArticleByUuid(const std::string& uuidString);
     int getMaxArticleNo() const;
diff --git a/src/core/utils.cpp b/src/core/utils.cpp
index 498e34f..10b1b5f 100644
--- a/src/core/utils.cpp
+++ b/src/core/utils.cpp
@@ -1,8 +1,8 @@
 #include "utils.h"
 
+#include <algorithm>
 #include <iomanip>
 #include <numeric>
-#include <algorithm>
 
 std::string formatCentAsEuroString(const int cent, int width)
 {
@@ -51,23 +51,24 @@ 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)
 {
     str.erase(str.find_last_not_of(chars) + 1);
     return str;
 }
- 
+
 std::string& trim(std::string& str, const std::string& chars)
 {
     return ltrim(rtrim(str, chars), chars);
 }
 
-bool case_insensitive_match(std::string s1, std::string s2) {
-   //convert s1 and s2 into lower case strings
-   transform(s1.begin(), s1.end(), s1.begin(), ::tolower);
-   transform(s2.begin(), s2.end(), s2.begin(), ::tolower);
-   if(s1.compare(s2) == 0)
-      return true; //The strings are same
-   return false; //not matched
+bool case_insensitive_match(std::string s1, std::string s2)
+{
+    // convert s1 and s2 into lower case strings
+    transform(s1.begin(), s1.end(), s1.begin(), ::tolower);
+    transform(s2.begin(), s2.end(), s2.begin(), ::tolower);
+    if (s1.compare(s2) == 0)
+        return true; // The strings are same
+    return false;    // not matched
 }
\ No newline at end of file
diff --git a/src/gui/basketmodel.cpp b/src/gui/basketmodel.cpp
index 2ac1931..d693782 100644
--- a/src/gui/basketmodel.cpp
+++ b/src/gui/basketmodel.cpp
@@ -1,8 +1,8 @@
 #include "basketmodel.h"
 
 #include <QFont>
-#include <QSettings>
 #include <QFontDatabase>
+#include <QSettings>
 
 BasketModel::BasketModel(Marketplace* market, QObject* parent)
     : QAbstractTableModel(parent), marketplace_(market)
@@ -22,7 +22,7 @@ QVariant BasketModel::data(const QModelIndex& index, int role) const
         QFont myFont;
 
         QFont myFixedFont = QFontDatabase::systemFont(QFontDatabase::FixedFont);
-	if (myFixedFont.fixedPitch() == false) {
+        if (myFixedFont.fixedPitch() == false) {
             myFixedFont.setFamily("monospace");
         }
 
diff --git a/src/gui/basketmodel.h b/src/gui/basketmodel.h
index 2a9b7fc..5cc6be6 100644
--- a/src/gui/basketmodel.h
+++ b/src/gui/basketmodel.h
@@ -7,7 +7,7 @@
 
 class BasketModel : public QAbstractTableModel
 {
-  Q_OBJECT
+    Q_OBJECT
 
   public:
     explicit BasketModel(Marketplace* market, QObject* parent = nullptr);
@@ -15,15 +15,12 @@ class BasketModel : public QAbstractTableModel
     virtual int columnCount(const QModelIndex& parent = QModelIndex()) const override;
     virtual QVariant data(const QModelIndex& index, int role = Qt::DisplayRole) const override;
     virtual QVariant headerData(int section, Qt::Orientation orientation, int role) const override;
-    //virtual Qt::ItemFlags flags(const QModelIndex& index) const override;
-    //virtual bool setData(const QModelIndex& index, const QVariant& value, int role = Qt::EditRole) override;
-    //virtual bool insertRows(int row, int count, const QModelIndex& parent = QModelIndex()) override;
     void addArticle(Seller* seller, int price, const std::string& desc);
     void finishSale();
     void cancelSale();
     virtual bool removeRows(int row, int count, const QModelIndex& parent = QModelIndex()) override;
 
-    signals:
+  signals:
     void basketDataChanged();
 
   private:
diff --git a/src/gui/kima2.cpp b/src/gui/kima2.cpp
index 1b6ad96..5ff27fb 100644
--- a/src/gui/kima2.cpp
+++ b/src/gui/kima2.cpp
@@ -19,14 +19,6 @@ int main(int argc, char* argv[])
     QCoreApplication::setOrganizationDomain("rustysoft.de");
     QCoreApplication::setApplicationName("kima2");
 
-    // Make sure that only one instance of the application runs
-    // Of course the uuid used here is unique to this application
-    // (commented out in favour of SingleApplication)
-    /*QSharedMemory shared("26297455-946a-4607-bfb7-5025a5f1e136");
-    if (!shared.create(512, QSharedMemory::ReadWrite)) {
-        exit(0);
-    }*/
-
     QTranslator qTranslator;
     QLocale german(QLocale::German);
 #ifdef __linux__
diff --git a/src/gui/mainwindow.h b/src/gui/mainwindow.h
index 755faa0..578886b 100644
--- a/src/gui/mainwindow.h
+++ b/src/gui/mainwindow.h
@@ -29,7 +29,7 @@ class MainWindow : public QMainWindow
     void onCancelAllArticlesButtonClicked(bool checked);
     void onAboutQt();
     void onAbout();
-    virtual bool eventFilter(QObject *target, QEvent *event) override;
+    virtual bool eventFilter(QObject* target, QEvent* event) override;
 
   protected:
     virtual void closeEvent(QCloseEvent* event) override;
diff --git a/src/gui/pricedialog.cpp b/src/gui/pricedialog.cpp
index f28f190..93a7223 100644
--- a/src/gui/pricedialog.cpp
+++ b/src/gui/pricedialog.cpp
@@ -33,7 +33,4 @@ void PriceDialog::accept()
     }
 }
 
-void PriceDialog::setForceDesc(bool force)
-{
-    forceDesc_ = force;
-}
\ No newline at end of file
+void PriceDialog::setForceDesc(bool force) { forceDesc_ = force; }
\ No newline at end of file
diff --git a/src/gui/reportdialog.h b/src/gui/reportdialog.h
index 64edc5c..14e298a 100644
--- a/src/gui/reportdialog.h
+++ b/src/gui/reportdialog.h
@@ -24,7 +24,8 @@ class ReportDialog : public QDialog
     void onReportViewSelectionChanged(const QItemSelection& selected,
                                       const QItemSelection& deselected);
 
-        private : Ui::ReportDialog ui_;
+  private:
+    Ui::ReportDialog ui_;
     Marketplace* market_;
     std::unique_ptr<ReportModel> model_;
 };
diff --git a/src/gui/salemodel.h b/src/gui/salemodel.h
index 91190e9..dc2623d 100644
--- a/src/gui/salemodel.h
+++ b/src/gui/salemodel.h
@@ -12,7 +12,7 @@ class SaleModel : public QAbstractItemModel
   public:
     explicit SaleModel(Marketplace* market, QObject* parent = nullptr);
     virtual QModelIndex index(int row, int column,
-                      const QModelIndex& parent = QModelIndex()) const override;
+                              const QModelIndex& parent = QModelIndex()) const override;
     virtual QModelIndex parent(const QModelIndex& index) const override;
     virtual QVariant data(const QModelIndex& index, int role) const override;
     virtual int rowCount(const QModelIndex& parent) const override;
diff --git a/src/gui/sellermodel.cpp b/src/gui/sellermodel.cpp
index 9b9e660..63b939e 100644
--- a/src/gui/sellermodel.cpp
+++ b/src/gui/sellermodel.cpp
@@ -26,9 +26,6 @@ QVariant SellerModel::data(const QModelIndex& index, int role) const
 
     Seller* seller = marketplace_->getSellers().at(index.row()).get();
 
-    /*      if (seller->getState() == Seller::State::DELETE)
-            return QVariant();
-     */
     switch (index.column()) {
     case 0:
         return seller->getId();
diff --git a/src/gui/sellermodel.h b/src/gui/sellermodel.h
index 5449bfb..0952bb4 100644
--- a/src/gui/sellermodel.h
+++ b/src/gui/sellermodel.h
@@ -7,7 +7,7 @@
 
 class SellerModel : public QAbstractTableModel
 {
-  Q_OBJECT
+    Q_OBJECT
 
   public:
     explicit SellerModel(Marketplace* market, QObject* parent = nullptr);
@@ -16,7 +16,8 @@ class SellerModel : public QAbstractTableModel
     virtual QVariant data(const QModelIndex& index, int role = Qt::DisplayRole) const override;
     virtual QVariant headerData(int section, Qt::Orientation orientation, int role) const override;
     virtual Qt::ItemFlags flags(const QModelIndex& index) const override;
-    virtual bool setData(const QModelIndex& index, const QVariant& value, int role = Qt::EditRole) override;
+    virtual bool setData(const QModelIndex& index, const QVariant& value,
+                         int role = Qt::EditRole) override;
     virtual bool insertRows(int row, int count, const QModelIndex& parent = QModelIndex()) override;
     virtual bool removeRows(int row, int count, const QModelIndex& parent = QModelIndex()) override;
 
diff --git a/src/printer/posprinter.h b/src/printer/posprinter.h
index 8ede494..fd92314 100644
--- a/src/printer/posprinter.h
+++ b/src/printer/posprinter.h
@@ -36,7 +36,8 @@ class PosPrinter
     void printHeader(const std::string& commune = "Musterhausen");
     void printTest();
     void printSaleReceipt(Sale* sale, const std::string& commune = "Dettingen");
-    void printSellerReceipt(Seller* seller, const int percent, const int maxFeeInCent, const std::string& commune = "Dettingen");
+    void printSellerReceipt(Seller* seller, const int percent, const int maxFeeInCent,
+                            const std::string& commune = "Dettingen");
     bool isValid();
 
     struct Command {