Typo fix

book/src/chapter_29.md

@@ -491,7 +491,7 @@ pub fn random_builder(new_depth: i32) -> Box<dyn MapBuilder> {
         4 => Box::new(DrunkardsWalkBuilder::open_area(new_depth)),
         5 => Box::new(DrunkardsWalkBuilder::open_halls(new_depth)),
         6 => Box::new(DrunkardsWalkBuilder::winding_passages(new_depth)),
-        7 => Box::new(MazeBuilder::new(new_depth))
+        7 => Box::new(MazeBuilder::new(new_depth)),
         _ => Box::new(SimpleMapBuilder::new(new_depth))
     }    
 }

chapter-29-mazes/src/map_builders/mod.rs

@@ -34,7 +34,7 @@ pub fn random_builder(new_depth: i32) -> Box<dyn MapBuilder> {
         4 => Box::new(DrunkardsWalkBuilder::open_area(new_depth)),
         5 => Box::new(DrunkardsWalkBuilder::open_halls(new_depth)),
         6 => Box::new(DrunkardsWalkBuilder::winding_passages(new_depth)),
-        7 => Box::new(MazeBuilder::new(new_depth))
+        7 => Box::new(MazeBuilder::new(new_depth)),
         _ => Box::new(SimpleMapBuilder::new(new_depth))
     }    
 }