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PairStar.java

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public class solution {

public static String addStars(String s) {

if(s.length()==1)

{

return s;

}

String small = addStars(s.substring(1));

if(small.charAt(0)==s.charAt(0))

{

return s.charAt(0)+"*"+small;

}

return s.charAt(0)+small;

}

}