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]: ikHaLEAdQxTpeFsdinttvMaceN
[A]: ikHaLEAdQxTpeFsntvMcN


[Q]: gjroYPFlHUuyuFQeDOEpoLOWKZ
[A]: gjroYPFlHUuyQeDOEpLWKZ


[Q]: ptUIcSNsiRtUWfLGkAOAf
[A]:
ptUIcSNsiRWfLGkAO