Function remove_header

src/mimeparser.rs:2073–2084

(
    headers: &mut HashMap<String, String>,
    key: &str,
    removed: &mut HashSet<String>,
)

}

fn remove_header(
    headers: &mut HashMap<String, String>,
    key: &str,
    removed: &mut HashSet<String>,
) -> Option<String> {
    if let Some((k, v)) = headers.remove_entry(key) {
        removed.insert(k);
        Some(v)
    } else {
        None
    }
}

/// Parses `Autocrypt-Gossip` headers from the email,
/// saves the keys into the `public_keys` table,