public static function clearQueryArg($code)
  {
    if (StringTools::left($code, 1) == '/') {
      $code = StringTools::right($code, StringTools::len($code)-1);
    }
    if (StringTools::right($code, 1) == '/') {
      $code = StringTools::left($code, StringTools::len($code)-1);
    }

    return $code;
  }