FString not work well when containing Chinese characters

Development Programming & Scripting C++
6 
       string UUtilityLib::GBKToUTF8(const string& strGBK)
{
	std::string strOutUTF8 = "";
	WCHAR* str1;
	int n = MultiByteToWideChar(CP_ACP, 0, strGBK.c_str(), -1, NULL, 0);
	str1 = new WCHAR[n+1];
	memset(str1, 0, n * 2 + 2);
	MultiByteToWideChar(CP_ACP, 0, strGBK.c_str(), -1, str1, n);
	n = WideCharToMultiByte(CP_UTF8, 0, str1, -1, NULL, 0, NULL, NULL);
	char* str2 = new char[n+1];
	memset(str2, 0, n + 1);
	WideCharToMultiByte(CP_UTF8, 0, str1, -1, str2, n, NULL, NULL);
	strOutUTF8 = str2;
	delete[]str1;
	str1 = NULL;
	delete[]str2;
	str2 = NULL;
	return strOutUTF8;
}

      auto name = "mn名字";
	auto utf8=  UUtilityLib::GBKToUTF8(name);
	FString testName = UTF8_TO_TCHAR(utf8.c_str());
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