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: wyfKgihlkYvlIOXsZWHlnOuaYJSnmW

SOLUTION: wyfKgihlkYvIOXsZWHnuaJSm

PROBLEM: SwUTgAzgSuHxHiuLjUMlBpkqrU

SOLUTION: SwUTgAzuHxiLjMlBpkqr

PROBLEM: YBzIMCsiNvbQNvaPVdtGtoPNQ

SOLUTION:
YBzIMCsiNvbQaPVdtGo

