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CodingBat code practice 22-inpairs-warmup-logicandloops > addCommas
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Given a string, return a new string where each two characters are separated by comma. Use only one of the methods recommended: length(), indexOf(), substring(),comareTo(), equals(), and +

addCommas("abc") → "a,b,c"
addCommas("ab") → "a,b"
addCommas("a,b") → "a,,,b"

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public String addCommas(String in) { }

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Difficulty: 210

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