Custom Farm Sugar Cane

function fuelItUp()
    turtle.select(16)
    needsFuel = turtle.getFuelLevel()
    minimumFuelLevel = 10
    hasFuel = turtle.getItemCount(16)
    useFuel = turtle.refuel()
    if needsFuel ~= "unlimited" then
        if tonumber(needsFuel) < tonumber(minimumFuelLevel) then
                if hasFuel > 0 then
                        turtle.refuel(1)
                else
                        print("Please insert fuel into slot 16")
                        repeat os.sleep(1)
                        until tonumber(turtle.getItemCount(16)) > 0
                        fuelItUp()
                end
        end
    end
    turtle.select(1)
end

function leftTurn()
    turtle.turnLeft()
    turtle.forward()
    turtle.dig()
    turtle.forward()
    turtle.digDown()
    turtle.turnLeft()
end

function rightTurn()
    turtle.turnRight()
    turtle.forward()
    turtle.dig()
    turtle.forward()
    turtle.digDown()
    turtle.turnRight()
end

function farmRow(length)
    fuelItUp()
    i = 0
    while i  < length do
        turtle.dig()
        turtle.forward()
        turtle.digDown()
         i = i + 1
    end
end

function moveUp()
    turtle.up()
    turtle.up()
end

function moveDown()
    turtle.down()
    turtle.down()
end

function backToChest()
    fuelItUp()
    turtle.forward()
    turtle.turnLeft()
    i = 0
    while i  < 14 do
        turtle.forward()
        i = i + 1
    end
    turtle.turnLeft()
    moveDown()
end

function dropToChest()
    i = 1
    while i  < 16 do
        turtle.select(i)
        turtle.dropDown()
        i = i+1
    end
    turtle.select(1)
end

function main()
    fuelItUp()
    moveUp()
    farmRow(11)
    leftTurn()
    farmRow(10)
    rightTurn()
    farmRow(10)
    leftTurn()
    farmRow(10)
    rightTurn()
    farmRow(10)
    leftTurn()
    farmRow(10)
    rightTurn()
    farmRow(10)
    leftTurn()
    farmRow(10)
    backToChest()
    dropToChest()
end

main()