Function resolve_username 

fn resolve_username(
    username: Option<String>,
    host: &str,
    config: &ClientConfig,
) -> String

Resolve the username from the provided value or SSH config.

Arguments

• username - Optional username to use. If None, will try to resolve from SSH config.
• host - The hostname (without port) to connect to.
• config - The client configuration containing SSH config path.

Returns

The resolved username.