Non duplicated values.

Used the counting sort algorithm to aid in the process.
Finished kaprekar.

This one took me a bit longer than I anticipated. I needed
to think more about how I converted the initial number
into an array of the digits in the number. After that I
had to convert from an array of digits back on an int. Not
converting from the array of digits back to an int slowed
me down. I kept thinking that I had some indices set incorrectly
when I would compute the sums.