Write a function repl ace_all 0,such that a call

newString = replace_all (str, substring, newSubstring);

will return a copy of string str with each occurrence of substring replaced by newSubstring.

Write a function that accepts two strings and determines whether one string is an anagram of the other, that is, whether one string is a permutation of the characters in the other string. For example, "dear" and "dare" are anagrams of "read."