let s = "hello world".to_string();
    for ch in s.chars() {
        print!({},ch);
    }

will iterate through a string character by character. That's the most common use of the "char" type - one at a a time, not arrays of them.

Although the proper grapheme form is:

    use unicode_segmentation::UnicodeSegmentation; // 1.7.1
    let s = "hello world".to_string();
    for gr in UnicodeSegmentation::graphemes(s.as_str(), true) {
        print!("{}", gr)
    }

This will handle accented characters and emoji modifiers. A line break in the middle of a grapheme will mess up output.

By the way, open season for proposing new emoji starts tomorrow.[1]

[1] http://blog.unicode.org/2020/09/emoji-150-submissions-re-ope...