laravel download image or file

Route

Route::get('file/{id}','FrontendController@get_file')->name('get_file');

Blade file

<div class="row">

    @foreach ($testimonial as $item)

    <div class="col-lg-4">

        <img src="{{ asset('/storage/'.$item->image) }}" height="500px" alt="">

        <a href="{{ route('get_file',$item->id) }}" class=" btn btn-secondary">Download</a>

    </div>

    @endforeach

</div>

Controller  

public function get_file($id){

        $dl=Testimonial::find($id);

        return response()->download(public_path('/storage/'.$dl->image));

    }