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Homework: Repeat Front

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

Given a non-null String and an int n, return a string made of the first n characters of the passed string, followed by the first n - 1 characters, and so on. So the String "Chocolate" with n = 4 yields "ChocChoChC". You may assume that n is between 0 and the length of the string, inclusive.