From and Into for String and &str

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• We can create a String from an &str by using the String::from() method because String implements the From trait for &str.
• We can also use the into method, but then we must tell Rust the expected type.
• For some reason we cannot use the Turbofish syntax.

examples/struct/from-str-into-string/src/main.rs

fn main() {
    let a = "Hello World!";
    println!("{a}");

    let b = String::from(a);
    println!("{b}");

    let c: String = a.into();
    println!("{c}");

    // let d = a.into::<String>();
    // method takes 0 generic arguments but 1 generic argument was supplied
    // println!("{d}");

    let e = Into::<String>::into(a);
    println!("{e}");
}