b) (4pts) Define a function encode in Racket. encode takes in a non-negative integer number n, and returns a function which takes in another function f as argument and returns a function that is equivalent to fr (applying f to input n times). For example (((encode 2) sqrt) 16) should evaluate to 2. When n is 0, fr should be the identity function id(x) = x. b) (4pts) Define a function encode in Racket. encode takes in a non-negative integer number n, and returns a function which takes in another function f as argument and returns a function that is equivalent to fr (applying f to input n times). For example (((encode 2) sqrt) 16) should evaluate to 2. When n is 0, fr should be the identity function id(x) = x