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]: urPUAGSMCdtYOaxOCmWXeaSdSZ
[A]: urPUAGSMCdtYOaxmWXeZ


[Q]: YWHyyWnPwmhBFJTLgavox
[A]: YWHynPwmhBFJTLgavox


[Q]: MlDKuBkwRGNIptTnWEQKo
[A]:
MlDKuBkwRGNIptTnWEQo