(define-struct circl [radius mode c])

(define-struct squar [side-length mode c])

(define-struct triangl [side-length mode c])

; A Shape is one of:

; - (make-circl Number Mode Color)

; - (make-squar Number Mode Color)

; - (make-triangl Number Mode Color)

; A Mode is one of:

; - "solid"

; - "outline"

Exercise 1 Design a function that given a Shape will output a drawing of that shape.

Exercise 2 Design a function that given a Shape will change its mode.

Exercise 3 Design a simple game that that starts with a blank screen. When someone enters "s", if the screen was blank, a circle is now drawn at the center of the screen. At every tick, a circle will change to a square, a square will change to a triangle, and a triangle will change to a circle. When someone enters "m", the mode of the shape (if any) will change. The shapes should never change their color or their radius/side-length. The game stops and displays a blank screen when someone presses "q".