Exercise 4: Write a stand-alone python script, based on Lab.6a Ex. 1

https://www.chegg.com/homework-help/questions-and-answers/1-write-function-takes-input-directory-function-search-directory-full-subdirectory-tree-bu-q35181262

Make a stand-alone script. The script will be executed with the command python3 lab6b.py [dirname] where [dirname] is the name of the directory you wish the script to explore (the subdirectory tree of). Thus the name of your script should be lab6b.py.

The script will output the 20 most common file extensions it finds in the subdirectory tree. Output the extension name in green, and the number of files with that extension in red.