tuples: whitespace cleanup for consistency.

rtchallenge/src/tuples.rs

@@ -34,6 +34,7 @@ impl Tuple {
     pub fn magnitude(&self) -> f32 {
         (self.x * self.x + self.y * self.y + self.z * self.z + self.w * self.w).sqrt()
     }
+
     pub fn normalize(&self) -> Tuple {
         let m = self.magnitude();
         Tuple {