Ryð•armanazi•villa•[e0046]: ekki allt eiginleiki atriði til framkvæmda, vantar: `summarize_author`

armanriazi•ryð•villa•[E0046]: ekki allt eiginleiki atriði til framkvæmda, vantar: `summarize_author`

//You must implement summarize_author and not only summarize
pub trait Summary {
    fn summarize(&self) -> String;
    fn summarize_author(&self) -> String;
}