fix clang

Author: Samuel Facchinello

src/test/java/com/thealgorithms/strings/LetterCombinationsOfPhoneNumberTest.java

@@ -17,7 +17,7 @@ public void testLetterCombinationsOfPhoneNumber(int[] numbers, List<String> expe
         assertEquals(expectedOutput, LetterCombinationsOfPhoneNumber.getCombinations(numbers));
     }
 
-        private static Stream<Arguments> provideTestCases() {
+    private static Stream<Arguments> provideTestCases() {
         return Stream.of(Arguments.of(null, List.of("")), Arguments.of(new int[] {}, List.of("")), Arguments.of(new int[] {2}, Arrays.asList("a", "b", "c")), Arguments.of(new int[] {2, 3}, Arrays.asList("ad", "ae", "af", "bd", "be", "bf", "cd", "ce", "cf")),
             Arguments.of(new int[] {2, 3, 4}, Arrays.asList("adg", "adh", "adi", "aeg", "aeh", "aei", "afg", "afh", "afi", "bdg", "bdh", "bdi", "beg", "beh", "bei", "bfg", "bfh", "bfi", "cdg", "cdh", "cdi", "ceg", "ceh", "cei", "cfg", "cfh", "cfi")));
     }