local function checkTool()
  if robot.durability() < 0.2 then
    repeat
      robot.select(2)
      robot.drop()
      robot.select(3)
      robot.drop()
      robot.select(4)
      robot.drop()
      robot.select(5)
      robot.drop()
      robot.select(6)
      robot.drop()
      robot.select(7)
      robot.drop()
      robot.select(8)
      robot.drop()
      robot.select(9)
      robot.drop()
      robot.select(10)
      robot.drop()
      robot.select(11)
      robot.drop()
      robot.select(17)
      robot.transferTo(2)
      c.craft(1)
    until robot.durability() == 1
  end
end