public static function getAssetFolderName($file_name)
    {
        $file_extension = strtolower(substr(strrchr($file_name,"."), 1));
        if (preg_match('/jpg|jpeg|gif|png|ico/', $file_extension)) {
            return 'img';
        }
        if ($file_extension === 'js') {
            return 'js';
        }
        if ($file_extension === 'css') {
            return 'css';
        }
        if ($file_extension === 'pdf') {
            return 'pdf';
        }
        return false;
    }