Cant Find The Bug! (turtle Miner)

-- made by 1869_Flame
local EnderchestSlot = 1
local ignoreCobbleSlot = 2
local ignoreDirtSlot = 3
local FuelSlot = 16
local function clear()
		term.clear()
		term.setCursorPos(1,1)
end
local function DigForward()
while turtle.detect() do
  turtle.dig()
end
end
local function DigDown()
while turtle.detectDown() do
  turtle.digDown()
end
end
local function DigUp()
while turtle.detectUp() do
  turtle.digUp()
end
end
local function CobbleDirt()
DigDown()
for i=1, 16 do
  turtle.select(i)
  if i <= 3 or i == 16 then
  -- we do nothing, as this is he ender and ignore slots
  else
   if turtle.compareTo(2) then
	if i ~= FuelSlot and i ~= EnderchestSlot and i ~= ignoreCobbleSlot and i ~= ignoreDirtSlot then
	 turtle.dropDown()
	end
   end
   if turtle.compareTo(3) then
	if i ~= FuelSlot and i ~= EnderchestSlot and i ~= ignoreCobbleSlot and i ~= ignoreDirtSlot then
	 turtle.dropDown()
	end
   end
  end
end
end
local function CheckEmptySlots()
	for i=1, 16 do
		if turtle.getItemCount(i) < 1 then
			return true
   else
		end
	end
CobbleDirt()
	return false
end
local function storeStuff()
if not CheckEmptySlots() then
  if EnderchestSlot >= 1 and EnderchestSlot <= 16 then
   turtle.turnLeft()
   turtle.turnLeft()
   sleep(0.8)
   for i = 1,5 do
	DigForward()
   end
   turtle.select(EnderchestSlot)
   turtle.place()
   sleep(0.1)
   for i = 1, 16 do
	turtle.select(i)
	if i ~= FuelSlot and i ~= EnderchestSlot and i ~= ignoreCobbleSlot and i ~= ignoreDirtSlot then
	 turtle.drop()
	end
   end
   sleep(0.1)  
   turtle.select(EnderchestSlot)
   turtle.dropDown()
   sleep(0.1)
   turtle.dig()
   turtle.select(1)
   turtle.turnLeft()
   turtle.turnLeft()
  end
end
end
local function CheckForRefuel()
if turtle.getFuelLevel() < 500 then
  oldFuel = turtle.getFuelLevel()
  turtle.select(FuelSlot)
  turtle.refuel(1)
  newFuel = turtle.getFuelLevel()
  if oldFuel >= newFuel then
   count = 1
   turtle.select(count)
   while not turtle.refuel() do
	count = count + 1
	turtle.select(count)
	if count >= 16 then
	 count = 0
	end
   end
  end
end
end
function slotsEmpty()
	for i=1, 16 do
		if turtle.getItemCount(i) < 1 then
			return true
		end
	end
	return false
end

local function clearDepthLine()
		for i = 1, depth do
   while not turtle.forward() do
	DigForward()
	DigUp()
	DigDown()
   end
   storeStuff()
   CheckForRefuel()
   DigUp()
   DigDown()
		end
end
local function clearWidthLine()
		for i = 1, width do
   while not turtle.forward() do
	DigForward()
	DigUp()
	DigDown()
	storeStuff()
   end
   CheckForRefuel()
   DigUp()
   DigDown()
		end
end

function Mine()
turns = 0
if depth >= width then
  turns = width
end

if width >= depth then
  turns = depth
end

clearDepthLine()
turtle.turnLeft()

clearWidthLine()
turtle.turnLeft()

clearDepthLine()
turtle.turnLeft()

while turns >=0 do
  turns = turns -1

  width = width - 1
  clearWidthLine()
  turtle.turnLeft()
  depth = depth - 1
  clearDepthLine()
  turtle.turnLeft()
end
end
--  Start  --
clear()
print("a Minerbot by 1869_Flame")
print("")
print("Please put an enderchest in slot 1")
print("Please put fuel in slot 16")
term.write("Insert depth: ")
depth = tonumber(read())
print(" ")

term.write("Insert width: ")
width = tonumber(read())
print(" ")

CheckForRefuel()
Mine()

print("im done!")