show.erb the second

gistfile1.txt

<div class="todo">
  <div class="panel panel-default">
    <div class="container">
      <div class="panel-body">
        <h2><%= @todo.id %>: <%= @todo.title %></h2>
        <h4>More Info: <%= @todo.description %></h4>
        <div class="row">
          <div class ="col-md-1">
            <a href="/todo" class="btn btn-default">Back</a>
            <a href="/todo/<%= @todo.id %>/edit" class="btn btn-info">Edit</a>

            <form action="/todo/<%= @todo.id %>complete" method="post">
              <input type="hidden" name="_method" value="put" />
              <input type="submit" value="Complete" class="btn btn-success">
            </form>

            <form action="/todo/<%= @todo.id %>" method="post">
              <input type="hidden" name="_method" value="delete" />
              <input type="submit" value="Delete" class="btn btn-danger">
            </form>
          </div>
        </div>
      </div>
    </div>
  </div>
</div>

Line 12 lacks a / between the todo.id and the complete
form action="/todo/<%= @todo.id %>/complete"