Function render_codeowners 

pub fn render_codeowners(
    community_rules: &str,
    paths: &[String],
    logins: &[String],
) -> String

A CODEOWNERS file: community_rules (the file’s own rules, the managed block removed), then the managed block last, so it wins for paths (the last matching pattern takes precedence). logins are resolved from numeric ids at run time.