public static isPresentNTimes(Sttring s,char c,int count,int numFound) {
   if (s.length()==0) {
     return (count == numFound);
   }
   if (s.charAt(0).equals(c)) {
    numFound++;
   }
   return isPresentNTimes(s.length()>1?s.substring(1):"",c,count,numCount);
}