Question

Use do to define (minimum lst) which returns the minimum of a list of numbers. You
may want to define an auxiliary procedure (smaller x y), using if, which returns the
smaller of two numbers.

I started doing this:
(defun minimum (lst)
"(lst) returns the smallest number of list."
(do ((numbers lst (cdr numbers))

But I'm stuck in the defining my command and would appreciate any insight greatly.