`&str` is a borrowed immutable UTF-8 slice; `String` is an owned growable buffer. Convert with `to_string()` and borrow back via deref coercion. Byte indexing is disallowed because UTF-8 characters vary in width; use `.chars()` instead.
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Fundamentals · easy
10. String and &str
Two string types and why.
Check your understanding
1. Which is owned and growable?
2. Why is s[0] rejected?