Scheme function that that duplicates each list element n times. Must not use append or any *, just cons and helper methods.

thanks!

need help achieving this:

(repeater '(x y) 3) = (x x x y y y)

(repeater '((x y) z) 3) = ((x x x y y y) (x x x y y y) (x x x y y y) z z z)