 code and fix these warnings as follow.
</p>

<ol>
  <li>
    Update <code>apply_action</code> so that the <code>Sleep</code>
    action turns a character from the <code>Tired</code> state to
    the <code>Hungry</code> state.
  </li>
  <li>
    Update <code>possible_changes_for_character</code> so that
    the <code>Tired</code> state behaves as the <code>Hungry</code>
    state.
  </li>
  <li>
    Update <code>describe_state</code> so that the description of
    the <code>Tired</code> state is <code>"tire