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Given a string str and an int n, return a string made of the first n characters of the string, followed by the first n - 1 characters of...
X106: repeatFront
Given a string str and an int n, return a string made of the
first n characters of the string, followed by the first n - 1
characters of the string, then the first n - 2, and so on. You may
assume that n is between 0 and the length of the string,
inclusive (i.e. n >= 0 and n <= str.length()).
Examples:
repeatFront("Chocolate", 4) -> "ChocChoChC"
repeatFront("Chocolate", 3) -> "ChoChC"
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