Minecraft Turtle: BakeCake

-----------Written by Barnet-----------
------------Introduction---------------
-- This is a program to bake cake.   --
-- You need to place one chest on    --
-- each side of the turtle (thats    --
-- 6 in total). They need to be      --
-- filled as followed:               --
---------------------------------------
--  Front: Milk Buckets              --
--   Left: Wheat                     --
--  Right: Sugar                     --
--    Top: Eggs                      --
-- Bottom: Empty (for empty buckets) --
--   Back: Empty (for the cakes)     --
---------------------------------------
-- Now just start the program and    --
-- watch how this turtle is baking   --
-- those sweet sweet cakes.          --
---------------------------------------
-- (Please do NOT fill the turtle    --
-- per hand. This could cause some   --
-- problems.)                        --
---------------------------------------

--functions----------------------------

function Next()
  x = turtle.getSelectedSlot()
  x=x+1
  turtle.select(x)
end

function CheckSlot()
  Item = turtle.getItemDetail()
  if Item.name == "" then
    return true
  else
    return false
  end
end

function CheckBucket()
  Item = turtle.getItemDetail()
  if Item.name == "minecraft:bucket" then
    return true
  else
    return false
  end
end

function RefillMilk()
  local o = 1
  while o<4 do
    turtle.select(o)
    if pcall(CheckSlot) == true then
      if CheckBucket() == true then
        turtle.dropDown(1)
        turtle.suck(1)
      end
    else
      turtle.suck(1)
    end
    if pcall(CheckSlot) == false then
      print("Missing milk!")
      error()
    end
    o=o+1
  end
end

function RefillSugar()
  turtle.select(5)
  if pcall(CheckSlot) == false then
    turtle.turnRight()
    turtle.suck()
    turtle.select(7)
    turtle.suck()
    turtle.turnLeft()
    if pcall(CheckSlot) == false then
      print("Missing sugar!")
      error()
    end
  end
end

function RefillEgg()
  turtle.select(6)
  if pcall(CheckSlot) == false then
    turtle.suckUp()
    if pcall(CheckSlot) == false then
      print("Missing eggs!")
      error()
    end
  end
end

function RefillWheat()
  turtle.select(9)
  if pcall(CheckSlot) == false then
    turtle.turnLeft()
    turtle.suck()
    turtle.suck()
    turtle.suck()
    turtle.turnRight()
    turtle.select(11)
    if pcall(CheckSlot) == false then
      print("Missing wheat!")
      error()
    end
  end
end

--main---------------------------------

while true do
  RefillMilk()
  RefillSugar()
  RefillEgg()
  RefillWheat()
  turtle.craft()
  turtle.turnRight()
  turtle.turnRight()
  turtle.select(12)
  turtle.drop()
  turtle.turnRight()
  turtle.turnRight()
end