Came to the comments to say the same. "subtract the total of the string integers" reads like "subtract the count" not "subtract the sum", should be rewritten to be clear. Especially since many katas are "do X with this portion of the data and Y with that portion of the data".

No need for parentheses as 'and' has priority over 'or'. Readability for humans suffer though :)

Ah, true. Had to read that three times to notice that.

No, you're wrong:

space-delimited list of minor words that must always be lowercase except for the first word in the string.

This one has recursion written all over it. Too bad I suck at recursion :D