* Create new Bookmark in selected Category
  */
 Route::post('/add-bookmark', function (Request $request) {
     if (Auth::check()) {
         $category = Category::findOrFail($request->category_id);
         $v = Validator::make($request->all(), ['name' => 'required|max:255', 'url' => 'required|max:255']);
         if ($v->fails()) {
             return redirect()->back()->withInput()->withErrors($v);
         }
         $bookmark = new Bookmark();
         $bookmark->name = $request->name;
         $bookmark->url = $request->url;
         $bookmark->description = trim($request->description);
         $bookmark->user_id = Auth::id();
         $bookmark->save();
         $bookmark->categories()->save($category);
         return redirect()->back();
     } else {
         return redirect('/');
     }
 });
 /**
  * GET /edit-bookmark/{id}
  * Present edit form for bookmark corresponding to {id}
  */
 Route::get('/edit-bookmark/{id}', function ($id) {
     if (Auth::check()) {
         $bookmark = Bookmark::findOrFail($id);
         $users = User::where('id', '!=', Auth::id())->get();
         return view('edit-bookmark', ['bookmark' => $bookmark, 'users' => $users]);
     } else {