<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def remove_folder(self, tree, prefix):
 """ Used to remove any empty folders If this folder is empty then it is removed. If the parent is empty as a result, then the parent is also removed, and so on. """

        while True:
            child = tree
            tree = tree.parent

            if not child.folders and not child.files:
                del self.cache[tuple(prefix)]
                if tree:
                    del tree.folders[prefix.pop()]

            if not tree or tree.folders or tree.files:
                break