comparetoCobbleAndDrop.lua

local robot = require("robot")

function invHelper.selectItemInInventory(item)
  local flag = false
  for i=1, 16, 1 do
    if invHelper.getItemName(i) == item then
      r.select(i)
      flag = true
      break
    end
  end
  return flag
end


for i = 2,32,1 do
robot.select(i)

invHelper.selectItemInInventory("minecraft:cobblestone")
if robot.compareTo(1) == true then
  robot.drop()
end

end