// **Exercise 09.1**: Write a testcase for the iterator, making sure it yields the corrects numbers.
//
-// **Exercise 09.2**: Write a function `iter_ldf` that iterators over the digits with the least-significant
+// **Exercise 09.2**: Write a function `iter_ldf` that iterates over the digits with the least-significant
// digits coming first. Write a testcase for it.
// ## Iterator invalidation and lifetimes