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: pRLRjmBQYxfuPuhnIiWinXvZknIW

SOLUTION: pRLjmBQYxfuPhnIiWXvZk

PROBLEM: xHCXluBTXtjlSLfosSmqok

SOLUTION: xHCXluBTtjSLfosmqk

PROBLEM: hKTjUWnplikUoORBRCmJL

SOLUTION:
hKTjUWnplikoORBCmJL

