lnwire: add 'x' separator in ShortChannelID method

Add the `AltString` method for `ShortChannelID` to produce a
human-readable format with 'x' as a separator
(block x transaction x output).

Signed-off-by: Nishant Bansal <nishant.bansal.282003@gmail.com>

Author: NishantBansal2003

lnwire/short_channel_id.go

@@ -56,6 +56,12 @@ func (c ShortChannelID) String() string {
 	return fmt.Sprintf("%d:%d:%d", c.BlockHeight, c.TxIndex, c.TxPosition)
 }
 
+// AltString generates a human-readable representation of the channel ID
+// with 'x' as a separator.
+func (c ShortChannelID) AltString() string {
+	return fmt.Sprintf("%dx%dx%d", c.BlockHeight, c.TxIndex, c.TxPosition)
+}
+
 // Record returns a TLV record that can be used to encode/decode a
 // ShortChannelID to/from a TLV stream.
 func (c *ShortChannelID) Record() tlv.Record {