2

while true do
 if turtle.getItemCount(2) < 1 then
 turtle.select(2)
 turtle.suckUp()
 end
  if turtle.getItemCount(3) > 0 then
  turtle.select(3)
  turtle.dropDown()
  end
   if turtle.getItemCount(2) > 0 then
   turtle.select(3)
   turtle.craft()
   turtle.dropDown()
   end
end