Function format_list 

pub fn format_list(list: &[String]) -> String

Formats a list of strings with commas and “and” if necessary. Uses the oxford comma.
Note: An attempt was made to genericize these functions to work with Vec<T : Display + Join>, but the Join trait is unstable.

Examples

assert_eq!(format_list(
           &vec![]),
           "nothing");

assert_eq!(format_list(&vec_string![
           "Nona"]),
           "Nona");

assert_eq!(format_list(&vec_string![
           "Nona", "Samantha"]),
           "Nona and Samantha");

assert_eq!(format_list(&vec_string![
           "Nona", "Samantha", "Lucy", "Charles"]),
           "Nona, Samantha, Lucy, and Charles");