TASK DEFINITION: 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.
PROBLEM: hKTjUWnplikUoORBRCmJL

SOLUTION: hKTjUWnplikoORBCmJL

PROBLEM: EigRJCRDNdacvvWkRwhmksTLKtQUj

SOLUTION: EigRJCDNdacvWkwhmsTLKtQUj

PROBLEM: UDpEypcSPamksrQnESqdDAN

SOLUTION:
UDpEycSPamksrQnqdAN