WorldEaterTurtle

function refuel()
    while turtle.getFuelLevel() < 40 do
        turtle.refuel()
    end
end

refuel()

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

function CheckLeft()
	turtle.turnLeft()
	if turtle.detect() == true then
		dig()
	else
		CheckRight()
	end
end
function CheckRight()
	turtle.turnRight()
	if turtle.detect() == true then
		dig()
	else
		CheckLeft()
	end
end
function CheckForward()
	if turtle.detect() == true then
		dig()
	else
		CheckRight()
		CheckLeft()
	end
end
function CheckDown()
	if turtle.detectDown() == true then
		turtle.digDown()
		turtle.down()
	else
		CheckForward()
	end
end
function CheckUp()
	if turtle.detectUp() == true then
		turtle.digUp()
		turtle.up()
	else
		CheckForward()
	end
end

while true do
	CheckDown()
	CheckUp()
	CheckForward()
	CheckLeft()
	CheckRight()
end