Function resolve_inbound_alias 

pub(super) fn resolve_inbound_alias(
    publish: &Publish<'_>,
    aliases: &mut InboundAliases,
) -> Result<Option<TopicBuf>, ()>

Resolves an inbound topic alias, returning the full topic if the alias was used. Returns Err(()) on a protocol error (alias 0 or above our advertised maximum).