diff --git a/core_writer.gif b/core_writer.gif
deleted file mode 100644
index 1605845..0000000
Binary files a/core_writer.gif and /dev/null differ
diff --git a/maidroid/api.lua b/maidroid/api.lua
index 46f7e8f..2528530 100644
--- a/maidroid/api.lua
+++ b/maidroid/api.lua
@@ -209,7 +209,7 @@ end)
 
 -- register empty item entity definition.
 -- this entity may be hold by maidroid's hands.
-;(function ()
+do
 	minetest.register_craftitem("maidroid:dummy_empty_craftitem", {
 		wield_image = "maidroid_dummy_empty_craftitem.png",
 	})
@@ -260,7 +260,7 @@ end)
 		on_step       = on_step,
 		itemname      = "",
 	})
- end) ()
+end
 
 ---------------------------------------------------------------------
 
diff --git a/maidroid_tool/api.lua b/maidroid_tool/api.lua
index 3ef4d00..6630336 100644
--- a/maidroid_tool/api.lua
+++ b/maidroid_tool/api.lua
@@ -3,8 +3,6 @@
 -- https://github.com/tacigar/maidroid
 ------------------------------------------------------------
 
-maidroid_tool.shared = {}
-
 -- maidroid_tool.shared.generate_writer is a shared
 -- function called for registering egg writer and core writer.
 function maidroid_tool.register_writer(nodename, options)
diff --git a/screenshot_readme.png b/screenshot_readme.png
deleted file mode 100644
index ad24c66..0000000
Binary files a/screenshot_readme.png and /dev/null differ