# Concatenating strings with `format!`

## Description

It is possible to build up strings using the `push` and `push_str` methods on a
mutable `String`, or using its `+` operator. However, it is often more
convenient to use `format!`, especially where there is a mix of literal and
non-literal strings.


## Example

```rust
fn say_hello(name: &str) -> String {
    // We could construct the result string manually.
    // let mut result = "Hello";
    // result.push_str(name);
    // result.push('!');
    // result

    // But using format! is better.
    format!("Hello {}!", name)
}
```


## Advantages

Using `format!` is usually the most succinct and readable way to combine strings.
In nearly all cases it will generate optimal code in terms of performance too.


Add missing file for concatenating strings
Add missing file for concatenating strings
