public function indexEtudiant()
 {
     $dashboardInfos = [];
     $etudiant = Etudiant::infos(session('uid'));
     $dashboardInfos['etudiant'] = $etudiant;
     $stage = Stage::infos(session('uid'));
     $stage = Stage::checkStageExiste($stage);
     $tuteur = Utilisateur::where('id', $stage->idEnseignant)->select('nom', 'prenom')->first();
     if (count($tuteur) == 0) {
         $tuteur = new Utilisateur();
         $tuteur->nom = "-";
         $tuteur->prenom = "";
     }
     $dashboardInfos['tuteur'] = $tuteur;
     $dashboardInfos['stage'] = $stage;
     return view("dashboard.dashboard")->with('dashboardInfos', $dashboardInfos);
 }