define a scheme function to swap the first two elements in a list

(a) Define a SCHEME function to swap the first two elements in a list named swap-first-two. (b) Modify your svap-first-two function so it works if there are less than two items in the list. (a) Define a SCHEME function to swap the first two elements in a list named swap-first-two. (b) Modify your svap-first-two function so it works if there are less than two items in the list