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.

Example Input: czewqqMLGCBKQLVGDtng
Example Output: czewqMLGCBKQVDtng

Example Input: eSfCVZsCDnsQYKZLJZknwVEUHre
Example Output: eSfCVZsDnQYKLJkwEUHr

Example Input: dDRIaLRVpuDRmnrhCCysD
Example Output:
dDRIaLVpumnrhCys

