funtools

funtools contain a collection of fun iterators to tinker with. For examples, see the tests directory.

```rust use funtools::Prime;

let firsthundred = vec![2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67, 71, 73, 79, 83, 89, 97]; let primes = Prime::new().takewhile(|x| x < &100).collect::>(); asserteq!(firsthundred, primes); ```

```rust use funtools::Prime;

let valid = Some(9973); let prime = Prime::new().takewhile(|x| x < &10000).last(); asserteq!(valid, prime); ```