competition index show subtitle

app/views/competitions/index.html.erb

@@ -8,7 +8,7 @@
               <%= image_tag(url_to_avatar(competition), :width => "100%", :height => "100%") %>
             </a>
             <div class="pt20 pl20 mb10 clearfix">
-              <a href="<%= competition_path(competition) %>" style="max-width: 400px;" class="font-16 task-hide fl" target="_blank"><%= competition.name %></a>
+              <a href="<%= competition_path(competition) %>" style="max-width: 400px;" class="font-16 task-hide fl" target="_blank"><%= [competition.name, competition.sub_title.presence].compact.join('——') %></a>
               <% if competition.start_time > Time.now %>
                 <% unless competition.enroll_end_time.present? && competition.enroll_end_time < Time.now %>
                   <div class="fr status-orange">