local function checkTool()
  while robot.durability() < 0.2 do
    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)
  end
end