Fix issue #1

src/main/java/tech/nevets/dliteserver/MessageDistributer.java

@@ -5,6 +5,7 @@ import java.io.OutputStream;
 import java.nio.charset.StandardCharsets;
 import java.util.HashMap;
 import java.util.Map;
+import java.util.Set;
 
 public class MessageDistributer extends OutputStream {
     private static Map<String, OutputStream> userStreams = new HashMap<>();
@@ -30,6 +31,11 @@ public class MessageDistributer extends OutputStream {
     }
 
     public void registerStream(String username, OutputStream os) {
+        Set<String> usernames = userStreams.keySet();
+        while (usernames.contains(username)) {
+            username += ".imposter";
+        }
+
         userStreams.put(username, os);
         try {
             this.write(("SERVER> Welcome, " + username + "!\n").getBytes(StandardCharsets.UTF_8));