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Java > String-1 > nTwice
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Given a string and an int n, return a string made of the first and last n chars from the string. The string length will be at least n.

nTwice("Hello", 2) → "Helo"
nTwice("Chocolate", 3) → "Choate"
nTwice("Chocolate", 1) → "Ce"

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