string randomStr( size_t Size ) {
    char[] Str = new char[ Size ];

  for( size_t a = 0; a < Size; a ++ )
    Str[ a ] = cast( char )( ( ( uniform( 0, 2 ) ) == 0 ? 'A' : 'a' ) + uniform( 0, 26 ) );

    return cast( string ) Str;
}