Formatter (#51)

Enforce consistent formatting use `dprint`

book/src/03_ticket_v1/12_outro.md

@@ -1,7 +1,7 @@
 # Wrapping up
 
-We've covered a lot of foundational Rust concepts in this chapter.  
-Before moving on, let's go through one last exercise to consolidate what we've learned. 
+We've covered a lot of foundational Rust concepts in this chapter.\
+Before moving on, let's go through one last exercise to consolidate what we've learned.
 You'll have minimal guidance this time—just the exercise description and the tests to guide you.
 
 ## References