Custom World Names upon Load

Hi everyone, hoping someone can help with this.

So what I am doing is using the world create options to load a world for temporary use and then close it afterwards (without saving).

So I have the custom world load and unload working, however, what I want to do is be able to have multiple instances of one map running (for example adventure maps)

So for instance, I load world "test" but I want to prefix or suffix it with the player name. So I am loading "test" for example, except I want it to be loaded as "player_test" or "test_player".

Code:java

 if(commandLabel.equalsIgnoreCase("instance_test")) {
World test = Bukkit.getWorld("test");
if(test == null){
player.sendMessage(ChatColor.GREEN + "Loading world, please standby.");
WorldCreator creator = new WorldCreator("test");
creator.environment(World.Environment.NORMAL);
creator.generateStructures(false);
test = creator.createWorld();
player.teleport(test.getSpawnLocation());
}
else
{
player.teleport(test.getSpawnLocation());
}
}

So that's how I am doing it so far. How can I get it to act as I wish?
Thanks in advance

(Pssst, Also if anyone knows how to spawn an entity (eg a Villager) and keep them in one spot (prevent just them moving), can you please tell me )

 

Anyone?