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