Function truncate40

vmm/src/main_service.rs:47–53

(s: &str)

fn app_id_of(compose_file: &str) -> String {
    fn truncate40(s: &str) -> &str {
        if s.len() > 40 {
            &s[..40]
        } else {
            s
        }
    }
    truncate40(&hex_sha256(compose_file)).to_string()
}