Crate anagram

Functions

count	Count the number of anagrams that can be formed from a word
get_next	Get the next lexicographically greater permutation This function will return either the next greater permutation or the lexicographically smallest permutation if the given word is the lexicographically greatest permutation Examples: “abc” -> “acb” “cba” -> “abc”
is_anagram	Check if a word is an anagram of another word
occurences	Count the number of occurences of an anagram in a word