public int countChar(String s, char target)
{
 if (s.length() == 0) {return 0;}
 
 else
 {
   if (s.charAt(0) == target) {return 1 + countChar(s.subString(1, s.length()), target);}
   else { return 0 + countChar(s.subString(1, s.length()), target);}
 }
 

 }

}