Thanks for the Console.WriteLine() advice. I didn't know we could use it for logging here in CodeWars.

Kata is now completed (forgot one Console.WriteLine line at the beginning :))

The negative zero problem seems to be gone. But now I got a new error:

✔ 8 assertions passed
✘ Expected string length 14 but was 13. Strings differ at index 0.
Expected: "-195595/564071"
But was: "195595/564071"
-----------^

This input is not included in tests, therefore I can't reproduce it to see what the new problem is. Can you please add it?

✘ It should work for random inputs too
Expected string length 6 but was 3. Strings differ at index 0.
Expected: "-0 1/5"
But was: "1/5"
-----------^

Man, there's no such thing as a negative zero. Fix this please.