Substr iterator

This library is made to iterate over a &str by a number of characters without allocating.

Usage

cargo add substr-iterator

let mut iter = substr_iterator::TrigramIter::from("whatever");
assert_eq!(iter.next(), Some(['w', 'h', 'a']));
let mut iter = substr_iterator::TrigramIter::from("今天我吃饭");
assert_eq!(iter.next(), Some(['今', '天', '我']));