kill.lua

local r = require("robot")
local inv = require("component").inventory_controller
local sizeInventory = r.inventorySize()

while true do
  if r.count(sizeInventory) == 0 and r.count(sizeInventory - 1) == 0 and r.count(sizeInventory - 2) == 0 and r.count(sizeInventory - 3) == 0 then
    local i = 0
    repeat
      if r.swing() then
        i = i + 1
      end
    until i ~= 100
  else
    for i = 1, sizeInventory do
      r.select(i)
      if r.count() ~= 0 then
        local item = inv.getStackInInternalSlot().name
        if item == "minecraft:skull" or item == "minecraft:coal" then
          r.dropUp()
        else
          r.dropDown()
        end
      end
    end
  end
end