initial commit

exercises/06_ticket_management/11_mutable_slices/src/lib.rs

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+// TODO: Define a function named `squared` that raises all `i32`s within a slice to the power of 2.
+//  The slice should be modified in place.
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn empty() {
+        let mut s = vec![];
+        squared(&mut s);
+        assert_eq!(s, vec![]);
+    }
+
+    #[test]
+    fn one() {
+        let mut s = [2];
+        squared(&mut s);
+        assert_eq!(s, [4]);
+    }
+
+    #[test]
+    fn multiple() {
+        let mut s = vec![2, 4];
+        squared(&mut s);
+        assert_eq!(s, vec![4, 16]);
+    }
+}