I think it makes a lot of sense.

what do you think about using divmod here?

what do you think about using divmod here?

What do you think about using Array(arr) instead of the type check?

You are totally right. I did not read it correctly. My mistake, sorry.

But it is. The instructions say: "...If a singular noun ends with a consonant and '-y', change '-y' to '-ies'. All other words just add '-s'". Isn't that rule enough?

Currently the difference in pluralizing day and fly is not covered in the rules in the instructions.
It would be helpful to add the relevance of vowels to the rules.

split already returns an array of strings, so .to-a is not necessary