* What is this for?

This utility scans a filetree and provides the following info:
how many files were modified by each month and under which paths.

The idea came to me when I found an old HDD I used in past, and by observing file stamps,
I tried to understand, to which epoch it belongs...

* Install
for Ubuntu:
 sudo apt install racket
 racket filetree_monthly_stat.rkt <path>

Or:
 https://download.racket-lang.org/