Improve quizes

exercises/quizzes/quiz1.rs

@@ -7,11 +7,10 @@
 // - An apple costs 2 rustbucks.
 // - However, if Mary buys more than 40 apples, the price of each apple in the
 // entire order is reduced to only 1 rustbuck!
+
 // 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(???) -> ??? {
+// fn calculate_price_of_apples(???) -> ??? { ??? }
 
 fn main() {
     // You can optionally experiment here.

solutions/quizzes/quiz1.rs

@@ -1,8 +1,7 @@
 // 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.
+// - However, if Mary buys more than 40 apples, the price of each apple in the
+// entire order is reduced to only 1 rustbuck!
 
 fn calculate_price_of_apples(n_apples: u64) -> u64 {
     if n_apples > 40 {

solutions/quizzes/quiz2.rs

@@ -1,10 +1,3 @@
-// This is a quiz for the following sections:
-// - Strings
-// - Vecs
-// - Move semantics
-// - Modules
-// - Enums
-//
 // Let's build a little machine in the form of a function. As input, we're going
 // to give a list of strings and commands. These commands determine what action
 // is going to be applied to the string. It can either be:

solutions/quizzes/quiz3.rs

@@ -1,7 +1,3 @@
-// This quiz tests:
-// - Generics
-// - Traits
-//
 // An imaginary magical school has a new report card generation system written
 // in Rust! Currently, the system only supports creating report cards where the
 // student's grade is represented numerically (e.g. 1.0 -> 5.5). However, the