Felling turtle

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 -- SLOT 13: FORWARD
        turtle.forward()
        refuel()
    elseif turtle.select(14) and turtle.compareDown() then -- SLOT 14: TREE
        turtle.turnRight()
        if 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()
        end
        turtle.turnLeft()
        turtle.forward()
    elseif turtle.select(15) and turtle.compareDown() then -- SLOT 15: TURN RIGHT
        turtle.turnRight()
        turtle.forward()
        refuel()
    elseif turtle.select(16) and turtle.compareDown() then -- SLOT 16: RECHARGE (See bottom for pattern)
        turtle.turnLeft()
        if turtle.select(2) and turtle.getItemCount() > 1 then
            turtle.drop(64)
            turtle.select(3)
            turtle.drop(64)
            turtle.select(2)
            turtle.suck(1)
            turtle.turnRight()
        end
        turtle.forward()
        turtle.forward()
        turtle.turnLeft()
        if turtle.select(4) and turtle.getItemCount() < 32 then
            while turtle.getItemCount() < 64 and turtle.suck(1) do
                print("+1")
            end
        end
        turtle.turnRight()
        turtle.forward()
        turtle.forward()
        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
        turtle.turnRight()
        turtle.forward()
        turtle.forward()
        refuel()
    end
end

--  COAL        ^
--              |
--  SAPLINGS    |
--
--  LOGS        T