Add sheet12

aufgaben/sheet12/task1/sleep-sort.rs

@@ -0,0 +1,8 @@
+
+fn main() {
+    let mut arr = [83, 12, 13, 35, 91, 71, 75, 58, 26, 38, 2, 23, 10];
+    sleep_sort(&mut arr);
+    assert_eq!(arr, [2, 10, 12, 13, 23, 26, 35, 38, 58, 71, 75, 83, 91]);
+}
+
+fn sleep_sort(arr: &mut [u64]) {}