repeatSeparator

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Given two strings, word and a separator, return a big string made of count occurences of the word, separated by the separator string.
repeatSeparator("Word", "X", 3) → "WordXWordXWord"
repeatSeparator("This", "And", 2) → "ThisAndThis"
repeatSeparator("This", "And", 1) → "This"

 public String repeatSeparator(String word, String sep, int count) 
 {
    String res=word;
    if(count==0) 
       return "";
   for(int i=1;i<count;i++)
   {
      res=res+sep;
      res=res+word;
   }
   return res;
}