static void normalize(StringBuilder number){
  String normalizedNumber=normalize(number.toString());
  number.replace(0,number.length(),normalizedNumber);
}

static void normalize ( StringBuilder number ) { String normalizedNumber = normalize ( number . toString ( ) ) ; number . replace ( 0 , number . length ( ) , normalizedNumber ) ; }
normalizes a string of characters representing a phone number . this is a wrapper for normalize ( string number ) but does in - place normalization of the stringbuilder provided .
