Stream Character Logic | Dataford Interview Questions

Implement a function to find the first non-repeating character in a stream of audio metadata packets.

Treat packets as an ordered list of strings and process characters in packet order. Return the first character whose total frequency in the complete stream is one, or "" if every character repeats.

Input/output: packets is a list of strings, and the function returns a string containing one character or an empty string.

Constraints

0 <= len(packets) <= 5000
Each packet is a string
The total number of characters across all packets is at most 5000
Characters are processed case-sensitively
Return exactly one character or an empty string

Function Signature

def find_first_non_repeating(packets):

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