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pais@kinetigram.com recursion01 > R17_pairStar
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APCS Recursion 1, Problem 7. Given a string, compute recursively a new string where identical chars that are adjacent in the original string are separated from each other by a "*".


R17_pairStar("hello") → "hel*lo"
R17_pairStar("xxyy") → "x*xy*y"
R17_pairStar("aaaa") → "a*a*a*a"

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public String R17_pairStar(String str) { }

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