Dont show bedrock players and send an error for getting your own skull as a bedrock player

BauSystem/BauSystem_Main/src/de/steamwar/bausystem/features/util/SkullCommand.java

@@ -44,6 +44,10 @@ public class SkullCommand extends SWCommand {
 
     @Register
     public void giveCommand(@Validator Player p) {
+        if (p.getName().startsWith(".")) {
+            BauSystem.MESSAGE.send("SKULL_INVALID", p);
+            return;
+        }
         giveCommand(p, p.getName());
     }
 
@@ -68,7 +72,7 @@ public class SkullCommand extends SWCommand {
 
             @Override
             public List<String> tabCompletes(CommandSender commandSender, PreviousArguments previousArguments, String s) {
-                return Bukkit.getOnlinePlayers().stream().map(Player::getName).filter(s1 -> !s1.endsWith("⍇")).collect(Collectors.toList());
+                return Bukkit.getOnlinePlayers().stream().map(Player::getName).filter(s1 -> !s1.startsWith(".")).collect(Collectors.toList());
             }
         };
     }