refactor bytes functions

testing/scenarios/socks5_helper.go

@@ -35,7 +35,7 @@ func appendAddress(request []byte, address v2net.Address) []byte {
 func socks5Request(command byte, address v2net.Destination) []byte {
 	request := []byte{socks5Version, command, 0}
 	request = appendAddress(request, address.Address())
-	request = append(request, address.Port().Bytes()...)
+	request = address.Port().Bytes(request)
 	return request
 }
 
@@ -43,7 +43,7 @@ func socks5UDPRequest(address v2net.Destination, payload []byte) []byte {
 	request := make([]byte, 0, 1024)
 	request = append(request, 0, 0, 0)
 	request = appendAddress(request, address.Address())
-	request = append(request, address.Port().Bytes()...)
+	request = address.Port().Bytes(request)
 	request = append(request, payload...)
 	return request
 }