I noticed some issues when using your substitution cipher in one of my programs #1
Description
So the biggest issue I had was when it came to capital letters and characters such as ( . , [ ] { } ( ) * & ^ % $ # @ ! ~ ` / < > ? | \ = + - _ ; : ' ")
sometimes it would ignore the special characters when ciphering/deciphering but other times it would try to cipher/decipher them. and when I tried editing the function to fix the issue and add support for the special characters and capital letters it resulted in really weird results and sometimes half the msg would refuse to decrypt or become out of place.
I was wondering if by chance you might be able to resolve that issue?