protected function ext($name, $ext)
    {
        // Obtain Info:
        
        $info = pathinfo($name);
        
        // Check Extension:
        
        if (!isset($info['extension']) || $info['extension'] !== $ext) {
            $name = sprintf('%s.%s', $name, $ext);
        }
        
        // Answer Name:
        
        return $name;
    }