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## strings
### Instructions
Write a function that receives a string slice and returns the number of character of the string
### Expected Function
```rust
fn char_length(s: &str) -> usize {
}
```
### Usage
Here is a program to test your function.
```rust
fn main() {
println!("length of {} = {}", "❤", char_length("❤"));
println!("length of {} = {}", "形声字", char_length("形聲字"));
println!("length of {} = {}", "change", char_length("change"));
println!("length of {} = {}", "😍", char_length("😍"));
}
```
And its output
```console
student@ubuntu:~/[[ROOT]]/test$ cargo run
length of ❤ = 1
length of 形声字 = 3
length of change = 6
length of 😍 = 1
student@ubuntu:~/[[ROOT]]/test$
```