Fixed sonar

Author: javadev

src/main/java/g3201_3300/s3248_snake_in_matrix/Solution.java

@@ -29,6 +29,7 @@ public int finalPositionOfSnake(int n, List<String> commands) {
                     if (y < n - 1) {
                         y++;
                     }
+                default:
                     break;
             }
         }