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]: CwQBJjXAtwxJSVmjIScuDA
[A]: CwQBJjXAtxSVmIcuD


[Q]: HuYHfZxsdwtzapmLmmFunDczqY
[A]: HuYfZxsdwtzapmLFnDcq


[Q]: nXnGFzHFYudOiHyWLZXQfpw
[A]:
nXGFzHYudOiyWLZQfpw


