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Homework: Without 2

Imported By: Geoffrey Challen
/ Version: 2021.6.0
/ Adapted from CodingBat

Given a String, if a length 2 substring appears at both the beginning and end, return a String without the substring at the beginning. So "HelloHe" yields "lloHe". The substring may overlap with itself, so "Hi" yields "". Otherwise, return the original string unchanged.

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