녹•armanazi•오류가•[e0046]:하지 않는 모든 특성 항목,구현 없:`summarize_author`

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armanriazi•녹•오류가•[E0046]:하지 않는 모든 특성 항목,구현 없:`summarize_author`

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

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