(MEDIUM) Given an input str and a target str, find and return the index in which an anagram of target occurs in str. Look out though: str will contain spaces and other non-letter characters, as well as capitalization. If target is not found within str, return -1 just like indexOf. Preconditions: target will contain only lowercase letters, str and target will both have length > 0.

HINT: searching through an alternate String might be easier, right? But then, how do you keep track of the original index positions? Also: a helper method for finding anagrams sounds fantastic.