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util.jid: Add join(node, host, resource) function to join the components and return nil if invalid

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equal deleted inserted replaced

-:730038d3e9e3
+:df9e18f5c808
 		end
 	end
 	return host;
 end
+function join(node, host, resource)
+	if node and host and resource then
+		return node.."@"..host.."/"..resource;
+	elseif node and host then
+		return node.."@"..host;
+	elseif host and resource then
+		return host.."/"..resource;
+	elseif host then
+		return host;
+	end
+	return nil; -- Invalid JID
+end
 return _M;