<div class='year1'>
      <h3>1 курс:</h3>
      <ul class='group-list'>
        <%@groups.each do |group|%>
        <% if group.name.slice(3, 1) == '1' %>
              <li id='<%= group.id %>'>
                <button class='ui-list'><%= link_to  group.name , group %></button>
                <% if admin %>
                  <div class='btn-con'><%= link_to 'Delete', group, remote: true, method: :delete%></div>
                <% end %>
              </li>
        <%end %>
      <%end%>
      </ul>
    </div>
    <div class='year2'>
    <h3>2 курс:</h3>
    <ul class='group-list'>
      <%@groups.each do |group|%>
      <% if group.name.slice(3, 1) == '2' %>
            <li>
              <button class='ui-list'><%= link_to  group.name , group %></button>
            </li>
      <%end %>
      <%end%>
      </ul>
    </div>
     <div class='year3'>
      <h3>3 курс:</h3>
      <ul class='group-list'>
      <%@groups.each do |group|%>
      <% if group.name.slice(3, 1) == '3' %>
            <li>
              <button class='ui-list'><%= link_to  group.name , group %></button>
            </li>
        <%end %>
      <%end%>
      </ul>
    </div>
     <div class='year4'>
      <h3>4 курс:</h3>
    <ul class='group-list'>
      <%@groups.each do |group|%>
      <% if group.name.slice(3, 1) == '4' %>
            <li>
              <button class='ui-list'><%= link_to  group.name , group %></button>
            </li>
      <%end %>
    <%end%>
    </ul>
    </div>