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.

[EX Q]: JvXQnblMcEKoPDpzkWUyQTcSluBpj
[EX A]: JvXQnblMcEKoPDpzkWUyTSuBj

[EX Q]: XTvynTEMpnKChFnxukxcRdfNFdpUQm
[EX A]: XTvynEMpKChFxukcRdfNUQm

[EX Q]: gDIPvWmlixrglCwaYyamVpPrGN
[EX A]:
gDIPvWmlixrCwaYyVpGN