Concatenate strings using format!

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• In this case all the strings are copied so it is less efficient than where we move the string, but this means we can continue to use the original variables.

examples/strings/concatenation-with-format/src/main.rs

fn main() {
    let string1 = String::from("Apple");
    let string2 = String::from("Banana");
    let str3    = "Peach";

    let text = format!("{}-{}-{}-{}", string1, string2, str3, "other");
    println!("{}", text);
    println!("{}", string1);
    println!("{}", string2);
    println!("{}", str3);
}

Apple-Banana-Peach-other
Apple
Banana
Peach