Refactor and move parsing and stanza to a separate package

stanza/packet.go

@@ -0,0 +1,18 @@
+package stanza
+
+type Packet interface {
+	Name() string
+}
+
+// Attrs represents the common structure for base XMPP packets.
+type Attrs struct {
+	Type StanzaType `xml:"type,attr,omitempty"`
+	Id   string     `xml:"id,attr,omitempty"`
+	From string     `xml:"from,attr,omitempty"`
+	To   string     `xml:"to,attr,omitempty"`
+	Lang string     `xml:"lang,attr,omitempty"`
+}
+
+type packetFormatter interface {
+	XMPPFormat() string
+}