Fix Checkstyle: add newline at end of FibonacciOptimized.java

Author: princekotadia

src/main/java/com/thealgorithms/recursion/FibonacciOptimized.java

@@ -21,4 +21,4 @@ static int fibonacci(int limit, int num1, int num2) {
             return fibonacci(limit - 1, num2, num1 + num2);
         }
     }
-}
+}