startup.lua

c = peripheral.wrap("front")

while true do
 if #c.list() <= 18 then
  turtle.select(1)
  turtle.turnRight()
  turtle.turnRight()
  turtle.select(1)
  turtle.suck()
  turtle.turnLeft()
  turtle.turnLeft()
  turtle.craft()

  for i=1,16 do
   turtle.select(i)
   turtle.drop()
  end
 else
  sleep(1)
 end
end