User turns:
user: Open up 'VisionX' folder. What's the human readible disk usage of that folder?
user: Create a file.
user:  The name should be based on the number of byte used. It should be in 'number.pdf' format.
user: Finally, in that file, Write my last question in it.

Involved APIs: GorillaFileSystem
Ground-truth function call path:
GorillaFileSystem.mkdir
GorillaFileSystem.find
GorillaFileSystem.cp
GorillaFileSystem.mv
GorillaFileSystem.grep