Formatter (#51)

Enforce consistent formatting use `dprint`

book/src/05_ticket_v2/04_if_let.md

@@ -15,14 +15,14 @@ impl Ticket {
 }
 ```
 
-You only care about the `Status::InProgress` variant. 
+You only care about the `Status::InProgress` variant.
 Do you really need to match on all the other variants?
 
 New constructs to the rescue!
 
 ## `if let`
 
-The `if let` construct allows you to match on a single variant of an enum, 
+The `if let` construct allows you to match on a single variant of an enum,
 without having to handle all the other variants.
 
 Here's how you can use `if let` to simplify the `assigned_to` method:
@@ -61,8 +61,8 @@ as the code that precedes it.
 
 ## Style
 
-Both `if let` and `let/else` are idiomatic Rust constructs.  
-Use them as you see fit to improve the readability of your code, 
+Both `if let` and `let/else` are idiomatic Rust constructs.\
+Use them as you see fit to improve the readability of your code,
 but don't overdo it: `match` is always there when you need it.
 
 ## References