style: fix formatting checkstyle

Author: alxkm

src/test/java/com/thealgorithms/stacks/DuplicateBracketsTest.java

@@ -48,8 +48,8 @@ void testDuplicateBracketsFalseCases(String input) {
 
     static Stream<Arguments> provideInputsThatShouldReturnFalse() {
         return Stream.of(Arguments.of("( )"), // whitespace inside brackets
-                Arguments.of("abc + def"), // no brackets
-                Arguments.of("(a + (b * c)) - (d / e)") // complex, but no duplicates
+            Arguments.of("abc + def"), // no brackets
+            Arguments.of("(a + (b * c)) - (d / e)") // complex, but no duplicates
         );
     }
 }