Join elements of vector into a string

• join

fn main() {
    let names = vec!["Foo", "Bar", "Baz"];
    println!("{:?}", names);

    let joined = names.join("");
    println!("{}", joined);

    let csv = names.join(",");
    println!("{}", csv);
}

["Foo", "Bar", "Baz"]
FooBarBaz
Foo,Bar,Baz