How to remove nested parentheses in LISP

Question

How can I remove nested parentheses recursively in Common LISP Such as

  (unnest \'(a b c (d e) ((f) g))) => (a b c d e f g)
  (unnest \'(a b))                    


        

Answer 1

Here's what I'd do:

(ql:quickload "alexandria")
(alexandria:flatten list)

That works mainly because I have Quicklisp installed already.