If you enter 11 the code will panic. I don't think this is a "best practice."

If you enter 11 the code return "Zero". I don't think this is a "best practice."

This code compiles for the pre-set test but does not consider the worst case. It is not a good practice not to consider the worst case. For example: If you enter an i32::Max or an i32::Min as a parameter, this code will panic. Reporting this code as "Best Practice" is not a good sign of knowing how to look deeply into the problem that has been posed.

If the goal is to pass the test, that's fine. But this code cannot be considered best practice because it does not consider the worst case.