[MC-CC] Turtle rails swapper

local actualSlotNumber = 1
local running = true

function placeTracks()
   while (turtle.getItemCount(actualSlotNumber) == 0) do
      actualSlotNumber = actualSlotNumber + 1
      if not turtle.select(actualSlotNumber) then
         return false
      end
   end
   if turtle.compareDown() then
      return false
   end
   turtle.digDown()
   turtle.placeDown()
   return turtle.forward()
end

turtle.select(actualSlotNumber)
while running do
   for i=1,4 do
      running = turtle.forward()
   end
   for i=1,4 do
      running = placeTracks()
   end
end