ADD file via upload

src/file_manager.h

@@ -0,0 +1,28 @@
+#ifndef FILE_MANAGER_H_
+#define FILE_MANAGER_H_
+
+#include <string>
+#include <vector>
+
+class FileManager {
+ public:
+  FileManager() = default;
+  
+  bool CreateUserDirectory(const std::string& username);
+  std::string GenerateFilename();
+  bool SaveQuestions(const std::string& username,
+                    const std::vector<std::string>& questions);
+  bool IsQuestionExists(const std::string& username,
+                       const std::string& question);
+  std::vector<std::string> LoadExistingQuestions(const std::string& username);
+
+ private:
+  static constexpr const char* kBasePath = "exams\\";  // Windows·<73><C2B7><EFBFBD>ָ<EFBFBD><D6B8><EFBFBD>
+  
+  // <20><><EFBFBD>ÿ<EFBFBD><C3BF><EFBFBD>
+  FileManager(const FileManager&) = delete;
+  FileManager& operator=(const FileManager&) = delete;
+  std::string UsernameToPinyin(const std::string& username);
+};
+
+#endif  // FILE_MANAGER_H_