Function format_xml::csv

pub fn csv<T>(collection: T) -> impl Display where
    T: IntoIterator,
    <T as IntoIterator>::Item: Display,
    <T as IntoIterator>::IntoIter: Clone, 

Displays an iterable with commas between each item.

let result = csv(&[1, 2, 3, 4]).to_string();
assert_eq!(result, "1,2,3,4");