Hello,
I think it could be useful adding an option (or creating a new function) to append some strings by automatically adding spaces. For example:
(append "my" "name" "is" "ale") --> "my name is ale"
Second request:
A function to perform more sophisticated upper-case/lower-case activities:
1) only capitals.
2) Only the first letter after a specific characteer (e.g.: ".").
Thank you.