Create a recursive function FIRSTLAST that takes a list as a parameter. It will return a list made up of the first and last item in the original list. Do error checking on the input (e.g. checking that it is a list of at least two items).

[26]> (firstlast '(a b c)) (a c) [28]> (firstlast "foo") Error in FIRSTLAST function. Parameter must be a list, but was "foo". NIL [30]> (firstlast '(((a) b c) 1 2 (3 5) 7 9)) ((a) b c) 9)