Final Turtle Mining Well Program

turtle.turnRight()
turtle.select(13)
turtle.place()
turtle.turnLeft()
turtle.back()
for i= 1,4 do
  turtle.place()
  turtle.turnLeft()
  turtle.forward()
  turtle.turnRight()
end
turtle.back()
turtle.turnRight()
turtle.forward()
turtle.turnLeft()
turtle.back()
turtle.select(15)
for c=1,4 do
  turtle.place()
  turtle.turnRight()
  turtle.forward()
  turtle.turnLeft()
end
turtle.select(14)
turtle.turnLeft()
turtle.forward()
turtle.turnRight()
turtle.up()
turtle.forward()
turtle.forward()
turtle.select(14)
for f=1,4 do
  turtle.placeDown()
  turtle.turnLeft()
  turtle.forward()
  turtle.turnRight()
end
turtle.turnRight()
  local f = turtle.getFuelLevel()
  if f < 100 then
    turtle.select(16)
    turtle.placeUp()
    turtle.suckUp()
    turtle.refuel(3)
    turtle.dropUp()
    turtle.digUp()
    turtle.select(14)
sleep(8)
for i=1,4 do
  turtle.forward()
  turtle.digDown()
end
turtle.down()
turtle.turnRight()
turtle.forward()
turtle.turnRight
for i=1,4 do
  turtle.dig()
  turtle.forward()
end
turtle.select(13)
turtle.turnRight()
turtle.forward()
turtle.forward()
turtle.turnRight()
for i=1,5 do
  turtle.dig()
  turtle.forward()
end
turtle.turnLeft()
turtle.turnLeft()
turtle.forward()
turtle.forward()
turtle.turnRight()
turtle.forward()