fixed in latest fork

Approved

python new test framework + random tests are required. updated in this fork

D translation

Rust translation

JS: tests should include fixed tests with empty strings or single character.

Python: no random tests.

Description is a mess and requires extensive cleaning

Fixed.

Some of the C cases are broken, not always, but sometimes the one-character is the wrong answer.
'G' - Expected: is not uppercase, received: is uppercase
From what I remember

Try re-publishing your kata

I think you cannot rank your own kata. That's make sence for me.

The function isn't static in the default code. Most C# katas use static functions. This one, for reasons unknown, apparently doesn't. In any case, removing static from the code will work.
Although, your code still won't pass because it is wrong. Maybe you should reread the description to make sure your function is doing what the kata asks for.