code: def close_room(room, namespace=None):
      
      socketio = flask.current_app.extensions['socketio']
      namespace = namespace or flask.request.namespace
      socketio.server.close_room(room, namespace=namespace)
docs: Close a room.
  
      This function removes any users that are in the given room and then deletes
      the room from the server.
  
      :param room: The name of the room to close.
      :param namespace: The namespace for the room. If not provided, the
                        namespace is obtained from the request context.