Function room_enabled_reply 

pub(crate) async fn room_enabled_reply(
    services: &Services,
    room_id: &RoomId,
    confirmation: &'static str,
    prefix: &'static str,
) -> Cow<'static, str>

Builds the reply for a command that re-enables a room’s inbound federation handling.

A room whose create event sets m.federate to false still cannot federate afterward, so the reply for such a room extends prefix with that caveat rather than confirming with confirmation. confirmation is a complete sentence; prefix is a fragment the caveat continues.