startup

local currentSlot = 1

while true do
  turtle.attack()
  turtle.select(currentSlot)
  local slotData = turtle.getItemDetail()

  if slotData ~= nil and slotData.name == "minecraft:bone" then
    turtle.turnRight()
    turtle.turnRight()
    turtle.drop(turtle.getItemCount() - 1)
    turtle.turnRight()
    turtle.turnRight()
  end

  if currentSlot < 16 then
    currentSlot = currentSlot + 1
  else
    currentSlot = 1
  end
end