fn append_edus(
items: Vec<(Vec<u8>, SendingEvent)>,
edus: impl Iterator<Item = (Vec<u8>, SendingEvent)>,
) -> Vec<(Vec<u8>, SendingEvent)>fn append_edus(
items: Vec<(Vec<u8>, SendingEvent)>,
edus: impl Iterator<Item = (Vec<u8>, SendingEvent)>,
) -> Vec<(Vec<u8>, SendingEvent)>