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.