I got another answer for Looking for C++/Python Open Source code library for cryptanalysis of classical ciphers ? Can I add this besides the question was closed? Or is there a way to get in contact with the author?
The best thing to do would be to get the question migrated to a different site (you should suggest where) or to ask the question again in a more appropriate place and give your answer there.
Since the question was deemed off-topic on this site neither the question nor the answer should be here. That's why you cannot add your answer.