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Recursion-1 > pairStar
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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 "*".

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

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public String pairStar(String str) { }

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