public function productCategory($id)
 {
     $pCategory = Product::ProductCategory($id)->get();
     $category = $this->category->find($id);
     $categories = Category::all();
     if ($category) {
         return view('store.category', compact('categories', 'products', 'pCategory'));
     }
     return redirect()->route('store.index')->with('category_exist', 'Category not exist!');
 }