Computercraft BuildTower Program (WIP)

function BuildLayer()
  for wall=1,4 do
    turtle.forward()
    turtle.place()
    turtle.turnLeft()
    turtle.forward()
    turtle.turnRight()
    turtle.place()
    turtle.turnRight()
    turtle.forward()
    turtle.forward()
    turtle.turnLeft()
    turtle.place()
    turtle.turnLeft()
    turtle.forward()
    turtle.turnRight()
    turtle.back()
    turtle.left()
  end
end

current=0
print("Please input how high the tower should be")
InputHeight = read()
For inv=1,9 do
  while turtle.getItemCount(inv) > 0 do
    For height=current,InputHeight do
      BuildLayer()
      current=current+1
    end
  end
end