How do i loop in a chest's inventory?

[mm2325]

on inventory open:
if type of event-inventory is chest inventory or ender chest inventory or barrel inventory or shulker box inventory:
send "You opened a chest!" to player
loop all items of event-inventory:
if loop-slot's item is not air:
send "%loop-slot's item%" to player

How do i loop in a chest's inventory. i don't know what else to ask or say except help

 

[ImOfflinezzz]

Hello. use

loop-item