Exercise 19

Write a function capitalize_last(phrase) that takes in a string phrase consisting of arbitrarily capitalized words separated by spaces, and returns a new string consisting of those words but with the only the last letter in each word uppercase.

You can assume that the string contains only letters and spaces, no punctuation.

Examples:

>>> capitalize_last('tEst WiTH rANdoM capITaliZATioN')

'tesT witH randoM capitalizatioN'

>>> capitalize_last('')

''

>>> capitalize_last('i am the senate')

'I aM thE senatE'