The Weekly Challenge

You are given a string paragraph and an array of the banned words. Write a script to return the most popular word that is not banned. It is guaranteed there is at least one word that is not banned and the answer is unique. The words in paragraph are case-insensitive and the answer should be in lowercase. The words can not contain punctuation symbols.

You are given two strings A and B of the same length. Write a script to return true if string B is a scramble of string A otherwise return false. String B is a scramble of string A if A can be transformed into B by a single (recursive) scramble operation.