prevent dupe players, fixed entered game message.

@@ -107,13 +107,13 @@ while True:
         for pid, pl in players.items():
             # send each player a message to tell them about the diconnected
             # player
-            if players[id]["name"] != None:
+            if players[pid]["name"] != None:
                 mud.send_message(pid, "{} quit the game".format(
-                                                        players[id]["name"]))
-            else:
-                save_object_to_file(players[id], "players/{}.json".format(players[id]["name"]))
+                                                        players[pid]["name"]))
 
         # remove the player's entry in the player dictionary
+        if players[id]["name"] != None:
+            utils.save_object_to_file(players[id], "players/{}.json".format(players[id]["name"]))
         del(players[id])
 
     # go through any new commands sent from players
@@ -130,6 +130,14 @@ while True:
             if command.strip() == '' or command is None:
                 mud.send_message(id, "Invalid Name")
                 continue
+            already_logged_in = False
+            for pid, pl in players.items():
+                if players[pid]["name"] == command:
+                     mud.send_message(id, "{} is already logged in.".format(command))
+                     mud.disconnect_player(id)
+                     already_logged_in = True
+            if already_logged_in:
+                continue
             loaded_player = utils.load_object_from_file("players/{}.json".format(command))
             if loaded_player is None:            
                 players[id]["name"] = command