fix clang

Author: Samuel Facchinello

src/main/java/com/thealgorithms/strings/LetterCombinationsOfPhoneNumber.java

@@ -8,18 +8,17 @@
 public final class LetterCombinationsOfPhoneNumber {
 
     // Mapping of numbers to corresponding letters on a phone keypad
-    private static final Map<Integer, String> numberToCharMap = Map.of(
-            0, "",
-            1, "",
-            2, "abc",
-            3, "def",
-            4, "ghi",
-            5, "jkl",
-            6, "mno",
-            7, "pqrs",
-            8, "tuv",
-            9, "wxyz"
-    );
+    private static final Map<Integer, String> numberToCharMap = Map.of( //
+        0, "", //
+        1, "", //
+        2, "abc", //
+        3, "def", //
+        4, "ghi", //
+        5, "jkl", //
+        6, "mno", //
+        7, "pqrs", //
+        8, "tuv", //
+        9, "wxyz");
 
     private LetterCombinationsOfPhoneNumber() {
         // Prevent instantiation