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Homework: plus Out

Imported By: Geoffrey Challen
/ Version: 2021.7.0
/ Adapted from CodingBat

Given a non-null String main and a non-empty String word, return a String where all characters in main have replaced by pluses ("+"), except for appearances of word which are preserved unchanged. So if main is "12xy34" and word is "xy" you should return "++xy++".