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CodingBat code practice

Java > 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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