implement all TODOs

src/main/java/chat/ChatClient.java

@@ -38,18 +38,38 @@ public class ChatClient {
 
     private void connectToServer() throws IOException {
         // TODO: create socket connection to host:port
+        Socket socket1 = new Socket(host, port);
         // TODO: initialize output stream (PrintWriter)
+        out = new PrintWriter(socket1.getOutputStream(), true);
         // TODO: initialize input stream (BufferedReader)
+        in = new BufferedReader(new InputStreamReader(socket1.getInputStream()));
     }
 
     private void readUserInputAndSend() throws IOException {
         // TODO: read continuously from console
         // TODO: send each input line to server
+//        while (true){
+//            String message = in.readLine();
+//            out.println(message);
+//        }
+        String userInput;
+        while ((userInput = consoleReader.readLine()) != null)
+        {
+            out.println(userInput);
+        }
     }
 
     private void cleanup() {
         // TODO: close socket safely
         // TODO: release resources
+        try {
+            if(socket != null && !socket.isClosed())
+            {
+                socket.close();
+            }
+        }catch (IOException e){
+            System.err.println("Error closing client: " + e.getMessage());
+        }
     }
 
     public static void main(String[] args) {

src/main/java/chat/ChatServer.java

@@ -42,17 +42,30 @@ public class ChatServer {
         // step 1: iterate through connectedClients safely
         // step 2: skip the sender client
         // step 3: send message to remaining clients using sendMessage
+        for(ClientHandler client: connectedClients)
+        {
+            if(!client.getUsername().equals(sender.getUsername()))
+            {
+                client.sendMessage(message);
+            }
+        }
     }
 
     public void broadcastSystemMessage(String message) {
         // step 1: iterate through all connected clients
         // step 2: send system message to each client
+        for(ClientHandler client: connectedClients)
+        {
+                client.sendMessage(message);
+        }
     }
 
     public void removeClient(ClientHandler clientHandler) {
         // step 1: remove client from connectedClients set
         // step 2: retrieve username from clientHandler
         // step 3: broadcast system message about user leaving
+        connectedClients.remove(clientHandler);
+        broadcastSystemMessage(clientHandler.getUsername() + " left");
     }
 
     public static void main(String[] args) {

src/main/java/chat/ClientHandler.java

@@ -39,7 +39,7 @@ public class ClientHandler implements Runnable {
     }
 
     private void requestUsername() throws IOException {
-        out.println("Enter your username:");
+        out.println("Enter your username: ");
         username = in.readLine();
         if (username == null || username.trim().isEmpty()) {
             username = "Anonymous";

src/main/java/chat/MessageListener.java

@@ -15,5 +15,15 @@ public class MessageListener implements Runnable {
     public void run() {
         // TODO: continuously read messages from server
         // TODO: print received messages immediately
+        try {
+            String message;
+            while ((message = inputReader.readLine()) != null)
+            {
+                System.out.println(message);
+            }
+
+        } catch (IOException e) {
+            throw new RuntimeException(e);
+        }
     }
 }