Fix "\x00FML3\x00" in server address (#422)

Signed-off-by: Fred Heinecke <fred.heinecke@yahoo.com>

mcproto/decode.go

@@ -2,6 +2,8 @@ package mcproto
 
 import (
 	"bytes"
+	"strings"
+
 	"github.com/pkg/errors"
 )
 
@@ -29,6 +31,9 @@ func DecodeHandshake(data interface{}) (*Handshake, error) {
 		return nil, err
 	}
 
+	// Forge Mod Loader adds some data after the server address. Truncate it.
+	handshake.ServerAddress, _, _ = strings.Cut(handshake.ServerAddress, string(rune(0)))
+
 	handshake.ServerPort, err = ReadUnsignedShort(buffer)
 	if err != nil {
 		return nil, err