分文件夹（未实现计算题目结果）

src/main/main.cc

@@ -1,6 +1,6 @@
 #include <QApplication>
-#include "main_window.h"
-#include "../shared/ibackend_service.h"
+#include "../frontend/main_window.h"
+#include "../shared/backend_interface.h"
 
 int main(int argc, char *argv[]) {
     QApplication app(argc, argv);