Tree Felling

turtle.refuel(1)
turtle.up()
o = 1

-- Checks for trees
local function compareT()
	turtle.select(3) -- select slot 3
	turtle.suckDown()
	if turtle.compare() then -- if space in front is slot 3(a tree)
		turtle.dig() -- dig said tree
		turtle.forward() -- move to where tree was
		turtle.digDown() -- take out bottom tree block
		turtle.select(2) -- select sapling
		turtle.placeDown() -- place sapling
		turtle.select(3) -- select tree again
		turtle.digUp() -- dig 3rd tree spot
		turtle.up() -- move up to 3rd tree spot
		turtle.digUp() -- dig 4th tree spot
		turtle.up() -- move up to 4th tree spot
		turtle.digUp() -- dig possible 5th tree spot
		turtle.up() -- move up to possible 5th tree spot
		if turtle.compareUp() then -- checks if there is another tree on 6th spot
			turtle.digUp() -- if there is, he will dig it
			turtle.up() -- then he will move up
			if turtle.compareUp() then -- repeat last check
				turtle.digUp()
			else
				turtle.down()
			end
		else
			turtle.down()
		end
		turtle.down()
		turtle.down()
		turtle.down()
		turtle.select(1) -- select slot 1 again
	else
		turtle.forward()
		turtle.select(1)
	end
end

-- Function to get the number of items in a given slot
local function bcount()
        return turtle.getItemCount(p)
end

-- Function to get the fuel level of the robot
local function fcount()
	return turtle.getFuelLevel()
end

-- check function
local function check()
	print ("My current fuel level is " .. fcount())
	turtle.suckDown()
	if fcount() < 1 then
		print ("Attempting to eat my fuel...")
		if turtle.getItemCount(1) < 1 then
			print ("I am out of fuel...")
			o = 0
		end
		turtle.select(1)
		turtle.refuel(1)
	end
end

repeat
	for t=1, 40 do
		compareT()
		check()
	end
	turtle.turnLeft()
	turtle.turnLeft()
until o < 1