In this task, you are given a string of characters. You need to remove duplicate characters from the string if any, and return the resulting string.

[Q]: QFAWjYIbRIJWvLvKLmdNsW
[A]: QFAWjYIbRJvLKmdNs


[Q]: ppVOlyLEPBhxIPhMqZGRzdvfVvH
[A]: pVOlyLEPBhxIMqZGRzdvfH


[Q]: dNrnbueSGYhdKguSDTykRjSwVY
[A]:
dNrnbueSGYhKgDTykRjwV