random tests added

Thanks so much for this very helpful description. I finally got it done!

Not sure if something updated but it appears System.out.print now works to some extent. The only condition is that your code compiles perfectly. Once that's satisfied, you should be able to print to console messages in your solution. You can also modify the example test cases to print out each case.

Without mutating object it would way easier. This one is more chalenging which is good in terms of Kata as programming challenge.

From my point of view, Kata is a given problem you have to resolve with code, not code you have to fix.