rustlings 6.5.0

Small exercises to get you used to reading and writing Rust code!
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// Calls of this function should be replaced with calls of `string_slice` or `string`.
fn placeholder() {}

fn string_slice(arg: &str) {
    println!("{arg}");
}

fn string(arg: String) {
    println!("{arg}");
}

// TODO: Here are a bunch of values - some are `String`, some are `&str`.
// Your task is to replace `placeholder(…)` with either `string_slice(…)`
// or `string(…)` depending on what you think each value is.
fn main() {
    placeholder("blue");

    placeholder("red".to_string());

    placeholder(String::from("hi"));

    placeholder("rust is fun!".to_owned());

    placeholder("nice weather".into());

    placeholder(format!("Interpolation {}", "Station"));

    // WARNING: This is byte indexing, not character indexing.
    // Character indexing can be done using `s.chars().nth(INDEX)`.
    placeholder(&String::from("abc")[0..1]);

    placeholder("  hello there ".trim());

    placeholder("Happy Monday!".replace("Mon", "Tues"));

    placeholder("mY sHiFt KeY iS sTiCkY".to_lowercase());
}