Function truncate_chars 

pub fn truncate_chars(s: &str, max_chars: usize) -> String

Truncate a string to a maximum character count, adding “…” if truncated.

This is useful for simple text truncation where unicode display width isn’t critical (e.g., log previews, notifications).

Example

let result = truncate_chars("Hello, World!", 8);
assert_eq!(result, "Hello...");