instruction:
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.
question:
FADtggVHWPgSKcVnyvGF
answer:
FADtgVHWPSKcnyvG


question:
vbzTYPGtcLOutwmpcLPOyjppQI
answer:
vbzTYPGtcLOuwmpyjQI


question:
MlDKuBkwRGNIptTnWEQKo
answer:

MlDKuBkwRGNIptTnWEQo


