public function UpdateSignup(Request $request)
 {
     $user = \Auth::user();
     $id = $user->id;
     $team = team_contents::where('studentID', '=', $user->id)->get(array('teamID'));
     $c = array();
     foreach ($team as $t) {
         $a = team::where('teamID', '=', $t->teamID)->first(array('competition'));
         array_push($c, $a->competition);
     }
     $cc = student_competition::where('studentID', '=', $user->id)->get(array('compID'));
     foreach ($cc as $b) {
         array_push($c, $b->compID);
     }
     $competition = competition::whereNotIn('compID', $c)->get();
     foreach ($competition as $a) {
         $numberwang = $request->get($a->compID);
         if ($numberwang == "on") {
             student_competition::create(['studentID' => $id, 'compID' => $a->compID]);
         }
     }
     return redirect('home');
 }