TreeFram

local numSapling = 0
local saplingSlot = 15
local fuelSlot = 16
local success, tree = turtle.inspect()


function checkFuel()
    if turtle.getFuelLevel() < 80 then
        turtle.select(fuelSlot)
        turtle.refuel(1)
        turtle.select(1)
    end
end

function plantSapling()
    turtle.select(saplingSlot)
    turtle.place()
    turtle.select(1)
end

function dance()
    turtle.turnLeft()
    turtle.turnRight()
    turtle.turnLeft()
    turtle.turnRight()
    turtle.turnLeft()
    turtle.turnRight()
end

function checkTree()
    while tree.name == "minecraft:birch_sapling" do
        turtle.turnLeft()
      success, tree = turtle.inspect()
    end
    cutTree()
end

function cutTree()
    turtle.dig()
    turtle.forward()
    while turtle.inspectUp() == true do
        turtle.digUp()
        turtle.up()
    end
    while turtle.inspectDown() == false do
        turtle.down()
    end
    turtle.back()
    plantSapling()
    success, tree = turtle.inspect()
end

function countSaplings()
    numSapling = turtle.getItemCount(saplingSlot)
end

function turtleStart()
    countSaplings()
    for i = 1, numSapling do
        checkFuel()
        checkTree()
    end
end

turtleStart()