Item changing

[BlockBoyZ]

say i wanted to make an gui where when one of the slots have been clicked, it changes that slot to a different item for that player, and it stays like that. Imagine you open a gui with the command /egg. In the first slot there was this egg named "Small Egg." If you click that egg, it changes the egg to "broken egg." now every time you open this inventory, it will say "broken egg." That's the plan, but I know nothing of skript

Thanks!