public static function getHtmlLink(EntityManagerInterface $em)
    {
        $repository = $em->getRepository(static::class);
        $videos = $repository->findAll();

        $basicLinks = [];

        foreach ($videos as $video) {
            $basicLinks[] = $video->getLink();
        }
        $parts = [];
        foreach ($basicLinks as $link) {
            $parts[] = explode('=', $link);
        }

        $linksId = [];
        foreach ($parts as $value) {
            $linksId[] = $value[1];
        }

        $htmlLinks = [];
        foreach ($linksId as $value) {
            $htmlLinks[] = 'https://www.youtube.com/embed/' . $value .'?ecver=2';
        }

        return $htmlLinks;
    }