I think the input could have been better described. The "Details" is to brief in this, imho.

C Translation

I was confused by the information at first, but in the end it was just easy, no much complexities. I think, it would be enough to write that it is first necessary to make the sum of numbers of the same values and return the highest of them as a result.

what the hell??

I liked the kata and found "some" solution, not exzctly the optimal.
However, am I wrong if I understand the story that the input must contain only string of uppercase(s)?
Because the attempts tested also one other option...

Maybe it is not 8 kyu?

please consider adding a bit help to your description here:

Your task is to create a function that returns true if the given number is a "known Wilson prime" and false otherwise.