std::string wtoa(const std::wstring& input) {
    std::string r(WideCharToMultiByte(CP_UTF8, 0, input.c_str(), input.size(), 0, 0, 0, 0), 0);
    WideCharToMultiByte(CP_UTF8, 0, input.c_str(), input.size(), &r[0], r.size(), 0, 0);
    return r;
}
std::wstring atow(const std::string& input) {
    std::wstring r(MultiByteToWideChar(CP_UTF8, 0, input.c_str(), input.size(), 0, 0), 0);
    MultiByteToWideChar(CP_UTF8, 0, input.c_str(), input.size(), &r[0], r.size());
    return r;
}

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