Hi! Can someone please help me figure out this (common) LISP programming question?

So far, I have the following:

(defun satisfy (fun lst) "(fun lst) Returns a list of the items in a list that satisfy a function." (do ((numbers lst (cdr numbers)) (sat ())) ((null numbers) sat) (if (funcall #'fun (car numbers)) (cons (car numbers) sat))))

I tried to cons all the numbers that satisfy the function into the list "sat", but it's not working properly... I think it's an issue with the way I've used the funcall function. Can someone explain it to me?

Use do, if, and funcall to define (satisfy fun 1st) which returns a list of the items in a list that satisfy a function. An item satisfies a function if the function returns true when that item is used as the function's argument. Use do, if, and funcall to define (satisfy fun 1st) which returns a list of the items in a list that satisfy a function. An item satisfies a function if the function returns true when that item is used as the function's argument