Rust•armanazi•error•[e0046]: not all trait items implemented, missing: `summarize_author`

armanriazi•rust•error•[E0046]: not all trait items implemented, missing: `summarize_author`

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