final protected function checkAppExist(string $appname):bool
    {
        if (file_exists(FEnvFcm::get("framework.apps").$appname)) {
            return (true);
        }
        return (false);
    }
final protected function checkAppExist(string $appname):bool
    {
        if (file_exists(FEnvFcm::get("framework.apps").$appname)) {
            return (true);
        }
        return (false);
    }
final protected function checkAppExist ( string $ appname ) : bool { if ( file_exists ( FEnvFcm :: get ( "framework.apps" ) . $ appname ) ) { return ( true ) ; } return ( false ) ; }
Check if app name exist
@param string $appname App name
@return bool If app exist
@throws Server500
Check if app name exist