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Homework: Every Nth

Imported By: Geoffrey Challen
/ Version: 2021.4.0
/ Adapted from CodingBat

Given a non-empty String and an int N, return the String made starting with char 0, and then every Nth charof the String. So if N is 3, use char 0, 3, 6, ... and so on. N is 1 or more.