Add TODO

Author: mo8it

exercises/quizzes/quiz1.rs

@@ -6,8 +6,8 @@
 // Mary is buying apples. The price of an apple is calculated as follows:
 // - An apple costs 2 rustbucks.
 // - If Mary buys more than 40 apples, each apple only costs 1 rustbuck!
-// Write a function that calculates the price of an order of apples given the
-// quantity bought.
+// TODO: Write a function that calculates the price of an order of apples given
+// the quantity bought.
 
 // Put your function here!
 // fn calculate_price_of_apples(???) -> ??? {