private void printArray(char input[]) {
        for(char ch : input) {
            System.out.print(ch);
        }
        System.out.println();
    }
Date 01/29/2016
@author Tushar Roy

Generate all permutations of string in lexicographically sorted order where repetitions of
character is possible in string.
src/com/interview/recursion/StringPermutation.java