Longest Sequence of Consecutive Zeroes

Published by Helen Yu in
language_fundamentalsloopsstrings

Write a function that returns the longest sequence of consecutive zeroes in a binary string.

Examples

longest_zero("01100001011000") ➞ "0000"

longest_zero("100100100") ➞ "00"

longest_zero("11111") ➞ ""

Notes

If no zeroes exist in the input, return an empty string.

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