Test

local function checkFuel()
  if turtle.getFuelLevel() < 10 then
      turtle.select(1)
      turtle.refuel(1)
  else
      turtle.select(15)
      turtle.placeUp()
      turtle.suck(5)
      turtle.digUp()
  end
end

local function MoveF()
  checkFuel()
  turtle.forward()
end

local function TurnL()
  checkFuel()
  turtle.turnLeft()
end

local function TurnR()
  checkFuel()
  turtle.turnRight()
end

local function Back()
  checkFuel()
  turtle.back()
end

local function Harvest()
  checkFuel()
  turtle.digDown()
  sleep(0.5)
  turtle.select(16)
  turtle.placeDown(1)
end

local function WalkF()
  MoveF()
  Harvest()
  MoveF()
  Harvest()
  MoveF()
  Harvest()
  MoveF()
  Harvest()
  MoveF()
  Harvest()
  MoveF()
  Harvest()
  MoveF()
  Harvest()
  MoveF()
  Harvest()
end
local function Harvester()
term.clear()
term.setCursorPos(1,1)
print("Ich arbeite...")
MoveF()
Harvest()
  WalkF()
TurnR()
MoveF()
Harvest()
TurnR()
  WalkF()
TurnL()
MoveF()
Harvest()
TurnL()
  WalkF()
TurnR()
MoveF()
Harvest()
TurnR()
  WalkF()
TurnL()
MoveF()
Harvest()
TurnL()
  WalkF()
TurnR()
MoveF()
Harvest()
TurnR()
  WalkF()
TurnL()
MoveF()
Harvest()
TurnL()
  WalkF()
TurnR()
MoveF()
Harvest()
TurnR()
  WalkF()
TurnL()
MoveF()
Harvest()
TurnL()
  WalkF()

turtle.turnLeft()
turtle.turnLeft()
MoveF()
MoveF()
MoveF()
MoveF()
MoveF()
MoveF()
MoveF()
MoveF()
turtle.turnRight()
MoveF()
MoveF()
MoveF()
MoveF()
MoveF()
MoveF()
MoveF()
MoveF()
term.clear()
term.setCursorPos(1,1)
print("Ich warte...")
  turtle.turnRight()
  turtle.back()
sleep(1)
  turtle.select(2)
  turtle.dropDown(64)
    turtle.select(3)
    turtle.dropDown(64)
      turtle.select(4)
      turtle.dropDown(64)
        turtle.select(5)
        turtle.dropDown(64)
          turtle.select(6)
          turtle.dropDown(64)
sleep(1800)
end

while true do
   Harvester()
  sleep(0.1)
end