public function create(string $confId)
 {
     if (!empty($confId)) {
         $conference = ConferenceModel::getConferenceById((int) $confId)[0];
         $data = array("confId" => $confId, "confName" => $conference['conference_title']);
         $this->view->render('lecture/create', $data);
     }
 }
 public function edit(string $confId)
 {
     $data = ConferenceModel::getConferenceById((int) $confId);
     $this->view->render('conference/edit', $data);
 }