[chore]: add some utils

server/src/utils/common_utils.cpp

@@ -9,4 +9,9 @@ void ShowErrorMessage(HWND hWnd, const std::wstring &message)
 std::string wstring_to_string(const std::wstring &wstr)
 {
     return boost::locale::conv::utf_to_utf<std::string::value_type>(wstr);
+}
+
+std::wstring string_to_wstring(const std::string &str)
+{
+    return boost::locale::conv::utf_to_utf<std::wstring::value_type>(str);
 }