function plugin_load(stellar, plug_env)
    print("now load lua plugin example load")
    print("this example aims to test load function")
    plug_env.data = "load plugin env"
    print("plugin env data is", plug_env.data)
end

function plugin_unload(plug_env)
    print("now unload lua plugin example load")
    print("plugin env data is", plug_env.data)
end