public function delete_category($delete_cat_id)
 {
     $user_info = Auth::user()->toArray();
     if ($user_info['user_type'] == 2) {
         $category = new Category();
         $is_category_deleted = $category->delete_category_by_id($delete_cat_id);
         return redirect("category/read_category");
         if ($is_category_deleted) {
             return redirect("category/read_category");
         } else {
             print_r('Data Not Deleted');
         }
     }
     $message = "you are not admin. you can't delete any category.";
     return view('welcome')->withMessage($message);
 }