Fixed link on related posts

_layouts/post.html

@@ -14,7 +14,7 @@ layout: default
     {% for post in site.related_posts limit:3 %}
       <li>
         <h3>
-          <a href="{{ site.baseurl }}/{{ post.url }}">
+          <a href="{{ site.baseurl }}{{ post.url }}">
             {{ post.title }}
             <small><time datetime="{{ post.date | date_to_xmlschema }}">{{ post.date | date_to_string }}</time></small>
           </a>