public function createuser(User $user)
 {
     $constants = new AppConstants();
     if ($this->isUserExist($user->user_email)) {
         $result = $constants->USER_ALREADY_EXISTS_STATUS();
     } else {
         if ($user->save()) {
             $result = $constants->USER_INSERT_SUCCESS_STATUS();
         } else {
             $result = $constants->USER_INSERT_FAILURE_STATUS();
         }
     }
     return $result;
 }