Refactor: Abstracted uppercase tokenized command

src/server.js

@@ -28,7 +28,8 @@ server.create = function create() {
     return net.createServer((socket) => {
         socket.on('data', function (data) {
             let tokenized = data.toString("ascii").split("\r\n")[0].split(" ")
-            switch (tokenized[0].toUpperCase()) {
+            let command = tokenized[0].toUpperCase()
+            switch (command) {
                 case  "PING":
                     if (tokenized[1] && tokenized[1] === "irc.example.com") {
                         socket.write("PONG irc.example.com\r\n")
@@ -62,7 +63,7 @@ server.create = function create() {
 
                     break;
                 default:
-                    console.error(`Unknown command: ${tokenized[0].toUpperCase()}`);
+                    console.error(`Unknown command: ${command}`);
             }
         }).on('error', (err) => {
             console.error(err);