Very good and fun kata. The description is clear for me but it could be better written and structured, including the title (lots of periods/ellipsis, unnecessary "Can you believe it?" etc). IMHO, if you have to explain something twice in your text then some if not all of the explanations are of no use. You could try to make it good simple. Also, is there a name for this property?

It's clearer now, thanks!

The description could be a bit more clear about the fact that a sentence is passed and not just a word, maybe providing a full example.

In my case, as I saw all examples were single words, I thought the input was just a word as well and only after I submitted the code I realized my mistake. Some people may not run into this problem, but that will enrich the description for sure.

Just a minor issue; other than that it is a really fun kata.

LOL only now I realized this kata was much easier than I thought. I read the description so fast that I didn't notice the size constraint and ended up creating a "infinite array" solution.

Anybody did that too?

Getting that too.

IMHO character case should be important or it should be declared as not required in the description.

Is the provided sample test supposed to pass with a proper solution?

I'm having the same issue; my code runs ok and the output is fine on repl.it, but it won't pass here.