支持多级目录（可选）\
整理后的根目录：意味着整理后文件会存放在这个目录下。
选择多级目录，会更加音乐的元数据进行整理分组文件。
## 删除空文件夹
删除文件夹下\*无任何文件\*的文件夹。\
例如 A/B/C 都为空， 会优先将 C 目录删除，不会将 A/B/C 级联删除，（如果想级联删除，再执行两次）
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