local h = 1

function filler()
if turtle.getFuelLevel()<10 then
turtle.select(1)
turtle.refuel(1)
turtle.select(2)
end
end

function digMove()
 turtle.down()
 turtle.digDown()
end

turtle.digDown()
while not turtle.detectDown() do
 filler()
 digMove()
end

turtle.select(1)

while h < 100 do
  filler()
 turtle.up()
 turtle.placeDown()
 if turtle.getItemCount(1)<3 then
  turtle.select(2)
  turtle.transferTo(1)
  turtle.select(1)
 end
 h = h + 1
end

run()