First Non-Repeating Character

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Problem

Given a string s, return the first character that appears exactly once while preserving the original order of characters. If no such character exists, return an empty string "". The input is a single string, and the output is a single character or an empty string.

Constraints

0 <= len(s) <= 10^5
s contains printable characters
Return the first unique character based on its original order

Function Signature

def first_non_repeating_char(s):

Your solutionPython 3

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