/**
  * @param string
  * @return string
  */
 public static function normalizeUrl($url)
 {
     $data = Github\Repository::getVendorAndName($url);
     if (is_null($data)) {
         return NULL;
     }
     return 'https://github.com/' . $data[0] . '/' . $data[1];
 }
 /**
  * @param string
  * @return bool
  */
 public static function isValid($url)
 {
     return is_array(GitHub\Repository::getVendorAndName($url));
 }