Function iter_join 

pub fn iter_join(
    separator: &str,
    iter: impl IntoIterator<Item: Display> + Clone,
) -> impl Display

Formats an iterator as an object whose display implementation is a separator-separated string of items from iter.

Performs a similar function to Itertools::format. Differences:

• Itertools::format panics if the returned formatting helper is formatted twice; conversely, iter_join requires that the iterator be Clone.
• iter_join only supports Display; .format supports all formatting traits.
• iter_join accepts an IntoIterator rather than requiring an Iterator.