public function normalizeLink($url)
    {
        if( property_exists($this,'normalizeLink') && is_callable($this->normalizeLink)){
            $fn = $this->normalizeLink;
            return $fn($url);
        }
        $parsed = $this->mdurl->parse($url, true);

        if ($parsed->hostname) {
            // Encode hostnames in urls like:
            // `http://host/`, `https://host/`, `mailto:user@host`, `//host/`
            //
            // We don't encode unknown schemas, because it's likely that we encode
            // something we shouldn't (e.g. `skype:name` treated as `skype:host`)
            //
            $is = false;
            foreach (self::RECODE_HOSTNAME_FOR as &$v) {
                if( ($is = $v === $parsed->protocol) ) break;
            }
            if (empty($parsed->protocol) || $is) {
                try {
                    $parsed->hostname = $this->punycode->toASCII($parsed->hostname);
                } catch (\Exception $e) { /**/ }
            }
        }

        return $this->mdurl->encode($this->mdurl->format($parsed));
    }