diff --git a/src/core/CMakeLists.txt b/src/core/CMakeLists.txt
index 504d0c3..8add251 100644
--- a/src/core/CMakeLists.txt
+++ b/src/core/CMakeLists.txt
@@ -29,11 +29,11 @@ set(CORE_SOURCES
 add_library(core STATIC ${CORE_SOURCES})
 target_include_directories(core PRIVATE ${PROJECT_SOURCE_DIR}/3rdparty/csv-parser/include)
 if (WIN32)
-    target_link_libraries(core PRIVATE printer Boost::boost Boost::date_time sqlite3 nlohmann_json::nlohmann_json ${XLNT_LIBRARY} csv)
+    target_link_libraries(core PRIVATE Boost::boost Boost::date_time sqlite3 nlohmann_json::nlohmann_json ${XLNT_LIBRARY} csv)
     target_link_libraries(core PRIVATE bcrypt)
 else()
-	target_link_libraries(core PRIVATE printer Boost::boost Boost::date_time sqlite3 nlohmann_json::nlohmann_json ${XLNT_LIBRARIES} csv)
+	target_link_libraries(core PRIVATE Boost::boost Boost::date_time sqlite3 nlohmann_json::nlohmann_json ${XLNT_LIBRARIES} csv)
 endif()
 
 #target_include_directories(core PRIVATE ${PROJECT_SOURCE_DIR}/3rdparty/csv-parser)
-target_include_directories(core PUBLIC ${CMAKE_CURRENT_SOURCE_DIR})
+target_include_directories(core PUBLIC ${CMAKE_CURRENT_SOURCE_DIR}/..)
diff --git a/src/core/utils.cpp b/src/core/utils.cpp
index 10b1b5f..83c7a3a 100644
--- a/src/core/utils.cpp
+++ b/src/core/utils.cpp
@@ -21,31 +21,6 @@ std::string formatCentAsEuroString(const int cent, int width)
     return currStream.str();
 }
 
-std::optional<PrinterDevice> convertToPosPrinterDevice(const std::string& device,
-                                                       const std::string& endpoint)
-{
-    if (device.empty()) {
-        return std::nullopt;
-    }
-
-    PrinterDevice printerDevice;
-    std::string delimiter = ":";
-    try {
-        printerDevice.idVendor = std::stoi(device.substr(0, device.find(delimiter)), 0, 16);
-        printerDevice.idProduct = std::stoi(device.substr(device.find(delimiter) + 1), 0, 16);
-        if (endpoint.empty()) {
-            printerDevice.endpoint = 0x03;
-        } else {
-            printerDevice.endpoint = std::stoi(endpoint, 0, 16);
-        }
-
-    } catch (std::exception& ex) {
-        throw ex;
-    }
-
-    return printerDevice;
-}
-
 std::string& ltrim(std::string& str, const std::string& chars)
 {
     str.erase(0, str.find_first_not_of(chars));
@@ -71,4 +46,4 @@ bool case_insensitive_match(std::string s1, std::string s2)
     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/core/utils.h b/src/core/utils.h
index 7ea6499..9ca2d32 100644
--- a/src/core/utils.h
+++ b/src/core/utils.h
@@ -1,15 +1,11 @@
-#ifndef UTILS_H
-#define UTILS_H
-
-#include "posprinter.h"
+#ifndef CORE_UTILS_H
+#define CORE_UTILS_H
 
 #include <locale>
 #include <optional>
 #include <string>
 
 std::string formatCentAsEuroString(const int cent, int width = 10);
-std::optional<PrinterDevice> convertToPosPrinterDevice(const std::string& vendor,
-                                                       const std::string& endpoint);
 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 ");
diff --git a/src/gui/basketmodel.h b/src/gui/basketmodel.h
index 5cc6be6..7c1858c 100644
--- a/src/gui/basketmodel.h
+++ b/src/gui/basketmodel.h
@@ -1,7 +1,7 @@
 #ifndef BASKET_MODEL_H
 #define BASKET_MODEL_H
 
-#include <marketplace.h>
+#include <core/marketplace.h>
 
 #include <QAbstractTableModel>
 
@@ -27,4 +27,4 @@ class BasketModel : public QAbstractTableModel
     Marketplace* marketplace_;
 };
 
-#endif
\ No newline at end of file
+#endif
diff --git a/src/gui/mainwindow.cpp b/src/gui/mainwindow.cpp
index 0df9658..32d8813 100644
--- a/src/gui/mainwindow.cpp
+++ b/src/gui/mainwindow.cpp
@@ -2,18 +2,18 @@
 
 #include "basketmodel.h"
 #include "config.h"
-#include "jsonutil.h"
 #include "pricedialog.h"
 #include "reportdialog.h"
 #include "salemodel.h"
 #include "sellerdialog.h"
 #include "settingsdialog.h"
 
-#include <utils.h>
-
-#include <csvreader.h>
-#include <excelreader.h>
-#include <posprinter.h>
+#include <core/csvreader.h>
+#include <core/excelreader.h>
+#include <core/jsonutil.h>
+#include <core/utils.h>
+#include <printer/posprinter.h>
+#include <printer/utils.h>
 
 #include <exception>
 #include <filesystem>
diff --git a/src/gui/mainwindow.h b/src/gui/mainwindow.h
index 578886b..12f9689 100644
--- a/src/gui/mainwindow.h
+++ b/src/gui/mainwindow.h
@@ -3,7 +3,7 @@
 
 #include "ui_mainwindow.h"
 
-#include <marketplace.h>
+#include <core/marketplace.h>
 
 #include <QMainWindow>
 #include <QtGui/QCloseEvent>
@@ -53,4 +53,4 @@ class MainWindow : public QMainWindow
     std::unique_ptr<Marketplace> marketplace_;
 };
 
-#endif
\ No newline at end of file
+#endif
diff --git a/src/gui/reportdialog.cpp b/src/gui/reportdialog.cpp
index 9cb7393..84971ec 100644
--- a/src/gui/reportdialog.cpp
+++ b/src/gui/reportdialog.cpp
@@ -2,8 +2,9 @@
 
 #include "mainwindow.h"
 
-#include <posprinter.h>
-#include <utils.h>
+#include <core/utils.h>
+#include <printer/posprinter.h>
+#include <printer/utils.h>
 
 #include <filesystem>
 
diff --git a/src/gui/reportdialog.h b/src/gui/reportdialog.h
index 14e298a..18e1802 100644
--- a/src/gui/reportdialog.h
+++ b/src/gui/reportdialog.h
@@ -5,7 +5,7 @@
 
 #include "reportmodel.h"
 
-#include <marketplace.h>
+#include <core/marketplace.h>
 
 #include <QDialog>
 
@@ -30,4 +30,4 @@ class ReportDialog : public QDialog
     std::unique_ptr<ReportModel> model_;
 };
 
-#endif
\ No newline at end of file
+#endif
diff --git a/src/gui/reportmodel.h b/src/gui/reportmodel.h
index 6509d2f..36855da 100644
--- a/src/gui/reportmodel.h
+++ b/src/gui/reportmodel.h
@@ -1,7 +1,7 @@
 #ifndef REPORT_MODEL_H
 #define REPORT_MODEL_H
 
-#include <marketplace.h>
+#include <core/marketplace.h>
 
 #include <QAbstractTableModel>
 
@@ -20,4 +20,4 @@ class ReportModel : public QAbstractTableModel
     int maxFeeInCent_{};
 };
 
-#endif
\ No newline at end of file
+#endif
diff --git a/src/gui/salemodel.cpp b/src/gui/salemodel.cpp
index 3549003..93289e1 100644
--- a/src/gui/salemodel.cpp
+++ b/src/gui/salemodel.cpp
@@ -1,6 +1,6 @@
 #include "salemodel.h"
 
-#include <article.h>
+#include <core/article.h>
 
 #include <algorithm>
 
diff --git a/src/gui/salemodel.h b/src/gui/salemodel.h
index dc2623d..6675bd6 100644
--- a/src/gui/salemodel.h
+++ b/src/gui/salemodel.h
@@ -1,7 +1,7 @@
 #ifndef SALEMODEL_H
 #define SALEMODEL_H
 
-#include <marketplace.h>
+#include <core/marketplace.h>
 
 #include <QAbstractItemModel>
 
@@ -28,4 +28,4 @@ class SaleModel : public QAbstractItemModel
     std::unique_ptr<Sale> rootItem{new Sale()};
 };
 
-#endif
\ No newline at end of file
+#endif
diff --git a/src/gui/sellermodel.h b/src/gui/sellermodel.h
index 0952bb4..32b6b7d 100644
--- a/src/gui/sellermodel.h
+++ b/src/gui/sellermodel.h
@@ -1,7 +1,7 @@
 #ifndef SELLER_MODEL_H
 #define SELLER_MODEL_H
 
-#include <marketplace.h>
+#include <core/marketplace.h>
 
 #include <QAbstractTableModel>
 
@@ -28,4 +28,4 @@ class SellerModel : public QAbstractTableModel
     Marketplace* marketplace_;
 };
 
-#endif
\ No newline at end of file
+#endif
diff --git a/src/gui/settingsdialog.cpp b/src/gui/settingsdialog.cpp
index ac3a7a4..57bcc81 100644
--- a/src/gui/settingsdialog.cpp
+++ b/src/gui/settingsdialog.cpp
@@ -2,9 +2,10 @@
 
 #include "mainwindow.h"
 
-#include <database.h>
-#include <posprinter.h>
-#include <utils.h>
+#include <core/database.h>
+#include <printer/posprinter.h>
+#include <printer/utils.h>
+#include <core/utils.h>
 
 #include <exception>
 #include <stdexcept>
@@ -116,4 +117,4 @@ void SettingsDialog::accept()
     }
 
     QDialog::accept();
-}
\ No newline at end of file
+}
diff --git a/src/gui/settingsdialog.h b/src/gui/settingsdialog.h
index 39e3086..da03ddc 100644
--- a/src/gui/settingsdialog.h
+++ b/src/gui/settingsdialog.h
@@ -3,7 +3,7 @@
 
 #include "ui_settingsdialog.h"
 
-#include <marketplace.h>
+#include <core/marketplace.h>
 
 #include <QDialog>
 
@@ -21,4 +21,4 @@ class SettingsDialog : public QDialog
     Marketplace* market_{};
 };
 
-#endif
\ No newline at end of file
+#endif
diff --git a/src/printer/CMakeLists.txt b/src/printer/CMakeLists.txt
index 84c58a6..9dfaa3e 100644
--- a/src/printer/CMakeLists.txt
+++ b/src/printer/CMakeLists.txt
@@ -11,6 +11,7 @@ endif()
 
 set(PRINTER_SOURCES
     posprinter.cpp
+    utils.cpp
 )
 
 add_library(printer STATIC ${PRINTER_SOURCES})
@@ -19,4 +20,4 @@ if(WIN32)
 else()
   target_link_libraries(printer core ${LibUSB_LIBRARIES})
 endif()
-target_include_directories(printer PUBLIC ${CMAKE_CURRENT_SOURCE_DIR})
+target_include_directories(printer PUBLIC ${CMAKE_CURRENT_SOURCE_DIR}/..)
diff --git a/src/printer/posprinter.cpp b/src/printer/posprinter.cpp
index 43a900f..368d483 100644
--- a/src/printer/posprinter.cpp
+++ b/src/printer/posprinter.cpp
@@ -1,6 +1,6 @@
 #include "posprinter.h"
 
-#include <marketplace.h>
+#include <core/marketplace.h>
 
 #include <boost/date_time/posix_time/posix_time.hpp>
 
@@ -213,4 +213,4 @@ bool PosPrinter::isValid()
         return true;
     else
         return false;
-}
\ No newline at end of file
+}
diff --git a/src/printer/posprinter.h b/src/printer/posprinter.h
index fd92314..4ddd083 100644
--- a/src/printer/posprinter.h
+++ b/src/printer/posprinter.h
@@ -1,8 +1,8 @@
 #ifndef POS_PRINTER_H
 #define POS_PRINTER_H
 
-#include <sale.h>
-#include <seller.h>
+#include <core/sale.h>
+#include <core/seller.h>
 
 #include <memory>
 
diff --git a/src/printer/utils.cpp b/src/printer/utils.cpp
new file mode 100644
index 0000000..10cb4ed
--- /dev/null
+++ b/src/printer/utils.cpp
@@ -0,0 +1,26 @@
+#include "utils.h"
+
+std::optional<PrinterDevice> convertToPosPrinterDevice(const std::string& device,
+                                                       const std::string& endpoint)
+{
+    if (device.empty()) {
+        return std::nullopt;
+    }
+
+    PrinterDevice printerDevice;
+    std::string delimiter = ":";
+    try {
+        printerDevice.idVendor = std::stoi(device.substr(0, device.find(delimiter)), 0, 16);
+        printerDevice.idProduct = std::stoi(device.substr(device.find(delimiter) + 1), 0, 16);
+        if (endpoint.empty()) {
+            printerDevice.endpoint = 0x03;
+        } else {
+            printerDevice.endpoint = std::stoi(endpoint, 0, 16);
+        }
+
+    } catch (std::exception& ex) {
+        throw ex;
+    }
+
+    return printerDevice;
+}
diff --git a/src/printer/utils.h b/src/printer/utils.h
new file mode 100644
index 0000000..4429ae9
--- /dev/null
+++ b/src/printer/utils.h
@@ -0,0 +1,12 @@
+#ifndef PRINTER_UTILS_H
+#define PRINTER_UTILS_H
+
+#include "posprinter.h"
+
+#include <optional>
+#include <string>
+
+std::optional<PrinterDevice> convertToPosPrinterDevice(const std::string& vendor,
+                                                       const std::string& endpoint);
+
+#endif