A generic trait that converts iterables into a `String`

iter_to_string.rs

trait IterToString {
    fn iter_to_string(self, separator: &str) -> String;
}

impl<T> IterToString for T
where
    T: IntoIterator,
    T::Item: ToString,
{
    fn iter_to_string(self, separator: &str) -> String {
        self.into_iter()
            .map(|item| item.to_string())
            .collect::<Vec<_>>()
            .join(separator)
    }
}