I want to don't use unwrap() in my code,but suddenly it become so wired especially in a clousure.In a closure I cannot handle error easyly by use ? because of the closure returns () not anyhow::Result<()> . Is there any resouce about error handle patten?

v.retain(|d| {
        let e = d.path().extension();
        if e.is_none() {
            return false;
        }
        //[INFO] checked
        let s = e.unwrap();
        let s = s.to_str();
        if s.is_none() {
            return false;
        }
        let s = s.unwrap();
        if s == "gz" {
            return true;
        }
        false
    });

another question is that is there anyway to handle error without return to upper function that better than match or if let Err(e) = run().

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