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:
YWHyyWnPwmhBFJTLgavox
answer:
YWHynPwmhBFJTLgavox


question:
kFYhXiGpfqXrSOvkICCiLY
answer:
kFYhXiGpfqrSOvICL


question:
NOXIdIppfrgUFWCgdPvNqsZOjPxB
answer:

NOXIdpfrgUFWCPvqsZjxB


