starting work on export module, added check trimming

mainwindow.h

@@ -19,6 +19,7 @@ class MainWindow : public QMainWindow {
     Parser parser;
 
 public:
+
     MainWindow(QWidget *parent = nullptr);
     ~MainWindow();
     void setupStoresList();
@@ -29,6 +30,8 @@ private slots:
 
     void on_parseButton_clicked();
 
+    void on_storeType_currentIndexChanged(int index);
+
 private:
     Ui::MainWindow *ui;
 };