question: public static ResponseCode createExtension ( String name ) { StringBuffer buffer = new StringBuffer ( name . length ( ) + 2 ) ; if ( ! name . startsWith ( "X" ) ) { buffer . append ( 'X' ) ; } buffer . append ( name ) ; return new ResponseCode ( buffer . toString ( ) ) ; }
target:  Creates an extension response code. Names that do not begin with 'X' will have 'X' prepended