href link contain base url in laravel 5

I'm trying to get url link form database in laravel5 like that.

<p class="title">{{$promotion->link}}</p>
<a href="{{$promotion->link}}" target="_blank" 
class="label label-info pull-right">View Link</a>

$promotion->link = "www.google.com";

Result >>

1.www.google.com
2.<a href="localhost/www.google.com".....

I don't know why the link in contain base url "localhost" . I can't redirect the link with url in my website. Please help and show me the right way.

Thanks and respect to all geek!!!

Solution

   <a href="/{{$promotion->link}}" target="_blank" class="label label-info pull-right">View Link</a>