pub fn format_event(
conn: &Connection,
caller_user_id: i64,
caller_device_id: &str,
event: &MatrixEvent,
) -> Result<Value, MatrixError>pub fn format_event(
conn: &Connection,
caller_user_id: i64,
caller_device_id: &str,
event: &MatrixEvent,
) -> Result<Value, MatrixError>