@ -42,12 +42,23 @@ fn find(v: &str, pat: char) -> usize {
Here is a program to test your function
```rust
fn main() {
println!("{}", is_empty(""));
println!("{}", is_ascii("rust"));
println!("{}", contains("rust", "ru"));
println!("{:?}", split_at("rust", 2));
println!("{}", find("rust", 'u'));
}
```
And its output
```console
student@ubuntu:~/[[ROOT]]/test$ cargo run
true
("ru", "st")
1
student@ubuntu:~/[[ROOT]]/test$