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This is a verified interview question from Mykaarma. Candidates reporting seeing this problem in recent Online Assessments (OAs) and onsite rounds. Mastering "Remove Duplicate Characters" covers key patterns like Strings.
"### Problem Given a string Str which may contain lowercase and uppercase characters. The task is to remove all duplicate characters from the string and find the resultant string. The order of remaining characters in the output should be the same as in the original string."
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