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Warmup-2 > stringTimes
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Given a string and a non-negative int n, return a larger string that is n copies of the original string.

stringTimes("Hi", 2) → "HiHi"
stringTimes("Hi", 3) → "HiHiHi"
stringTimes("Hi", 1) → "Hi"

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public String stringTimes(String str, int n) { }

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