Write a function, every-second-element, that returns every second element of a list. As examples
(every-second-element '(a b c)) => (a c)
(every-second-element '(a b c d)) => (a c)
It is often worthwhile to go for a more general solution than actually needed. Therefore, program (every-nth-element n lst) where n >= 1 and lst is a proper list.
Can you define every-second-element in terms of every-nth-element?