Discussion on: Daily Challenge #44 - Mexican Wave

fn wave(s: &str) -> Vec<String> {
    (0..s.len())
        .map(|i| {
            s.chars()
                .enumerate()
                .map(|(j, c)| if j == i { c.to_ascii_uppercase() } else { c })
                .collect::<String>()
        })
        .filter(|strs| !(strs.chars().all(|c| c.is_lowercase() || c.is_whitespace())))
        .collect()
}