std::string UtfWToUtf8( const wchar_t* str )
{
    if ( str && str[0] )
    {
        std::wstring_convert<std::codecvt_utf8<wchar_t>> conv1;
        return conv1.to_bytes( str, str + wcslen( str ) );
    }
    return std::string();
}

std::wstring Utf8ToUtfW( const char* str )
{
    if ( str && str[0] )
    {
        std::wstring_convert<std::codecvt_utf8<wchar_t>> conv1;
        return conv1.from_bytes( str, str + strlen( str ) );
    }
    return std::wstring();
}