chop

function move()
    turtle.dig()
    turtle.forward()
end

function turn()
    turtle.turnRight()
    move()
end

function chopUp()
    while turtle.detectUp() do
        turtle.digUp()
        turtle.up()
    end
end

function checkBelow()
    if turtle.detectDown() then
        success, data = turtle.inspectDown()
        if success then
            if data.name ~= "minecraft:log" or data.name ~= "minecraft:leaves" then
                return false
            end
        end
    else
        return false
    end
end


function chopDown()
    repeat
        turtle.digDown()
        turtle.down()
    until not checkBelow()
end

function placeSapling()
    turtle.select(2)
    turtle.place()
    turtle.select(1)
end

function reUp()
    if turtle.getItemCount(1) == 0 then
        turtle.select(1)
        turtle.suckDown()
    end
end

function treeGrew()
    local success, data = turtle.inspect()
    if success then
        if data.name == "minecraft:log" or data.name == "minecraft:log"then
            return true;
        else
            return false;
        end
    end
end

function growTree()
    repeat
        reUp()
        turtle.place()
    until treeGrew()
end


while true do
    growTree()
    move()
    chopUp()
    move()
    chopUp()
    chopDown()
    turn()
    chopUp()
    move()
    chopUp()
    chopDown()
    turn()
    placeSapling()
end