In C.

Write a program anagram that sorts the letters in a word, which is useful when searching for anagrams. anagram takes a single argument, which is a string containing only lower-case letters, sorts the letters alphabetically, and then prints the sorted letters. You may use any sorting algorithm you are familiar with, but you must write the sort function yourself. You may not use any sort function provided by a library.

Usage $ ./anagram hello

ehllo

$ ./anagram positivity

iiiopsttvy

$ ./anagram abcdef

abcdef