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CodingBat code practice hcs-strings > hcsStringsGimmeLastN
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Given an input String and an int n, return a String containing the last n characters of the input (in order). Precondition: the input will have at least n characters.

hcsStringsGimmeLastN("Wave hello", 5) → "hello"
hcsStringsGimmeLastN("Wave hello", 2) → "lo"
hcsStringsGimmeLastN("Wave goodbye", 7) → "goodbye"

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

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