Add rustlings

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diff --git a/rustlings/exercises/quizzes/quiz1.rs b/rustlings/exercises/quizzes/quiz1.rs
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+// This is a quiz for the following sections:
+// - Variables
+// - Functions
+// - If
+//
+// Mary is buying apples. The price of an apple is calculated as follows:
+// - 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.
+// fn calculate_price_of_apples(???) -> ??? { ??? }
+
+fn main() {
+    // You can optionally experiment here.
+}
+
+// Don't change the tests!
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn verify_test() {
+        assert_eq!(calculate_price_of_apples(35), 70);
+        assert_eq!(calculate_price_of_apples(40), 80);
+        assert_eq!(calculate_price_of_apples(41), 41);
+        assert_eq!(calculate_price_of_apples(65), 65);
+    }
+}