将子目录内的文件全部提取出来到指定目录。
新建一个空目录，在空目录内新建target文件夹和smash文件夹，将要打散的目录整个放进smash内，运行bat，所有文件会被放入target内。完成后删除smash即可。 提示：重名文件会被覆盖
To excavate all the files in subdirs to specific directory.
Creat a new folder, creat folders named "target" and "smash", put the directory you wish to smash into "smash", run the bat. All the files will go to target. You can delete "smash" after that. Note: File name conflict will cause the overwrite.