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.

Input: Consider Input: SQBoeSRHVIZoNXohmlLcdefoCi

Output: SQBoeRHVIZNXhmlLcdfCi

Input: Consider Input: ppVOlyLEPBhxIPhMqZGRzdvfVvH

Output: pVOlyLEPBhxIMqZGRzdvfH

Input: Consider Input: hwuafkzTfllMQgESKLgjUY
Output: hwuafkzTlMQgESKLjUY