display my collections link only for logged users

app/views/shared/application/_collections.html.erb

 <div class="row">
   <div class="col-md-12">
-    <h4><b><a href="/collections">Institucionais</a></b></h4><br>
-    <h4><b><a href="/collections/me">Minhas Coleções</a></b></h4>
+    <h4><b><%= link_to collections_path, 'Institucionais' %></b></h4><br>
+    <% if user_signed_in? %> <h4><b><%= link_to collections_me_path, 'Minhas coleções' %></b></h4> <% end %>
   </div>
 </div>