Your menu() function has a loop.
I would call the entries inside and not after the loop.
The entries have to explicitly return after being done, not calling the menu() again.
If you want a menu for another level call menu() explicitly, like that your sub-menu is in the next call stack.
FWIW, if you really need this flow but without littering the call stack, you might also use the goto &NAME feature in perl after pushing the arguments onto @_ .
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