Hi,
afaik there is no such addon as it is restricted by the API to properly withdraw items from guild banks autoamtically.
At least the last time I checked it you got kicked from the server for message spam or were not able to propery make that work if multiple items would be withdrawn.
But it should be somehow possible, at least "Roomba Guild Bank Stacker" withdraws items, stacks them and deposits them again afterwards.
But I remember it's code is quite hacky and might break any time again, so I doubt anyone created and addon like you ask for, because it's very maintenance intensive.
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