function getSlot(name, damage)
  for i=1,16 do
    local data = turtle.getItemDetail(i)

    if data and data.name == name and data.damage == damage then
      return i
    end

  end

  return 0
end

function dropSlot(slot)


function update()
  local slots = {
    getSlot("Botania:manaResource", 0),
    getSlot("Botania:manaResource", 1),
    getSlot("Botania:manaResource", 2)
  }

  for i,slot in slots do
    if slot == 0 then
      return
    end
  end

  for i,slot in slots do
    turtle.select(slot)
    turtle.dropDown(1)
  end
end

update()