Create a function that capitalizes the last letter of every word.
cap_last("hello") ➞ "hellO"
cap_last("My Name Is Innokodakademija") ➞ "MY NamE IS Innokodakademija"
cap_last("HELp THe LASt LETTERs CAPITALISe") ➞ "HELP THE LAST LETTERS CAPITALISE"
There won't be any cases of punctuation in the tests.