Felling turtle program

function refuel()
    if turtle.getFuelLevel() < 150 then
        turtle.select(1)
        while turtle.getFuelLevel() < 150 do
            turtle.refuel(1)
        end
    end
end

while true do
    refuel()
    if turtle.select(13) and turtle.compareDown() then
        turtle.forward()
        refuel()
    elseif turtle.select(14) and turtle.compareDown() then
        if turtle.turnRight() and turtle.select(2) and turtle.compare() then
            while turtle.compare() do
                turtle.dig()
                turtle.digUp()
                turtle.up()
            end
            turtle.select(14)
            while not turtle.compareDown() do
                turtle.down()
            end
            refuel()
            turtle.select(4)
            turtle.place()
        else
            turtle.turnLeft()
        end
    elseif turtle.select(15) and turtle.compareDown() then
        turtle.turnLeft()
        turtle.forward()
        refuel()
    elseif turtle.select(16) and turtle.compareDown() then
        if turtle.turnRight() and turtle.select(4) and turtle.getItemCount() < 32 then
            while turtle.getItemCount() < 64 do
                turtle.suck(1)
            end
        end
        turtle.turnLeft()
        if turtle.select(1) and turtle.getItemCount() < 64 then
            while turtle.getItemCount() < 64 and turtle.suck(1) do
                print("Récupération charbon...")
            end
        end
        if turtle.select(2) and turtle.getItemCount() > 1 then
            turtle.up()
            turtle.drop(64)
            turtle.select(3)
            turtle.drop(64)
            turtle.select(2)
            turtle.suck(1)
            turtle.down()
        end
        turtle.turnLeft()
        refuel()
    end
end