private static byte unescape(String s,int i){
  return (byte)Integer.parseInt(s.substring(i + 1,i + 3),16);
}

private static byte unescape ( String s , int i ) { return ( byte ) Integer . parseInt ( s . substring ( i + 1 , i + 3 ) , 16 ) ; }
un - escape and return the character at position i in string s .
