turtle ender quarry thing

i=0 --for the first for loop
x=0 --for the main loop
y=1 --for item slot checker
turtle.select(1)
print("How long do you want the sides to be?")--put any text here to ask how long the side will be
length=read("9")--this retrieves to reply
--this function will make the walls
function Side()
	for i=0,(length-2) do
	CheckFences()
		if turtle.placeDown() == false then

			turtle.digDown()
			turtle.placeDown()

		end
		if turtle.forward() == false then

			turtle.dig()

		end

	end
end
function SideBreak()
	for i=0,(length-2) do
	CheckFences()
		turtle.digDown()
		turtle.forward()


	end
end
function SideBreakfirstandlast()
	for i=0,(length-3) do
	CheckFences()
		turtle.digDown()
		turtle.forward()


	end
end
function CheckFences()
	while turtle.getItemCount(y)<1 do
		y=y+1
		turtle.select(y)
	end
end
--main loop
while x<4 do
	CheckFences()
	Side()
	turtle.turnLeft()
	x=x+1
end
turtle.forward()
print("Are you ready SMASH SOME FENCES!!!!!?")
if read("yes") then
	x=0
	SideBreakfirstandlast()
	turtle.turnLeft()
	while x<2 do
		SideBreak()
		turtle.turnLeft()
		x=x+1
	end
	SideBreakfirstandlast()
	turtle.digDown()
end