Fix: add braces for checkstyle

Author: shreeya-g10

src/main/java/com/thealgorithms/backtracking/UniquePermutation.java

@@ -22,7 +22,9 @@ private UniquePermutation() {
 
     public static List<String> generateUniquePermutations(String input) {
         List<String> result = new ArrayList<>();
-        if (input == null) return result;
+        if (input == null) {
+            return result;
+        }
 
         char[] chars = input.toCharArray();
         Arrays.sort(chars); // important: sort to detect duplicates

src/test/java/com/thealgorithms/backtracking/UniquePermutationTest.java

@@ -1,22 +1,22 @@
 package com.thealgorithms.backtracking;
 
-import static org.junit.jupiter.api.Assertions.assertEquals;
-
 import java.util.Arrays;
 import java.util.List;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
 import org.junit.jupiter.api.Test;
 
 public class UniquePermutationTest {
 
     @Test
-    void testUniquePermutations_AAB() {
+    void testUniquePermutationsAab() {
         List<String> expected = Arrays.asList("AAB", "ABA", "BAA");
         List<String> result = UniquePermutation.generateUniquePermutations("AAB");
         assertEquals(expected, result);
     }
 
     @Test
-    void testUniquePermutations_ABC() {
+    void testUniquePermutationsAbc() {
         List<String> expected = Arrays.asList("ABC", "ACB", "BAC", "BCA", "CAB", "CBA");
         List<String> result = UniquePermutation.generateUniquePermutations("ABC");
         assertEquals(expected, result);