Format so it's better to see that this is an assignment

I don't know whether you are crazy about this, but if we format it like this i think it's easier to see that this is not just a normal if/else block but an assignment of the if/else-expression:

```
    let big_n =
        if n < 10 {
            println!("small number, increase ten-fold");

            10 * n
        } else {
            println!("big number, reduce by two");

            n / 2
        };
```

compared to
```
    let big_n = if n < 10 {
        println!("small number, increase ten-fold");

        10 * n
    } else {
        println!("big number, reduce by two");

        n / 2
    };
```