The tests don't have a punctuation scenario in them. That's why it passed. Maybe the Kata should be updated to have punctuation?

I agree with Bruce.. this doesn't work with punctuation if it exists in one of the split words or on its own. I agree this is the best linq solution "pigit" for "Non-punctuated" strings, but I"m not sure why this is the most recommended solution when handling puncuation as a special case was specifically called out in the problem set... hmmm... I'm not even sure how this passed the tests for the Kata?