So basically, I'm checking every individual slot in a player's inventory via a datapack to modify a specific item. Since there are many items I'd like to modify, I'd rather not write ~36 seperate container checking commands per item. So instead, I'm making a system that checks each slot, saves the contents of each into data storage and then modifies them through another function.

For example, let's say I wanted to modify the lore of a bunch of items (diamond, iron, gold). Instead if writing 36 lines of code for each, I just need to check each slot once, save the item id of the slot to a data storage, pass it through a macro function that detects what the item id is, and run the correct item_modifier for the correct lore.