Resolved Checkstyle violations

Author: kkn2k19

src/test/java/com/thealgorithms/misc/fourSum.java

@@ -1,45 +1,61 @@
+package com.thealgorithms.misc;
+
 import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.List;
 
-public class fourSum {
-    public static List<List<Integer>> fourSum(int[] nums, int target) {
+public class FourSum {  // Class name changed
+    // Method name changed to findFourSum
+    public static List<List<Integer>> findFourSum(int[] nums, int target) {
         List<List<Integer>> result = new ArrayList<>();
-        if (nums == null || nums.length < 4) return result;
+        if (nums == null || nums.length < 4) {
+            return result;  // Added curly braces for 'if'
+        }
 
         Arrays.sort(nums); // Sort the array first
 
         for (int i = 0; i < nums.length - 3; i++) {
-            if (i > 0 && nums[i] == nums[i - 1]) continue; // Skip duplicates
+            if (i > 0 && nums[i] == nums[i - 1]) {
+                continue;  // Added curly braces for 'if'
+            }
             for (int j = i + 1; j < nums.length - 2; j++) {
-                if (j > i + 1 && nums[j] == nums[j - 1]) continue; // Skip duplicates
+                if (j > i + 1 && nums[j] == nums[j - 1]) {
+                    continue;  // Added curly braces for 'if'
+                }
                 int left = j + 1, right = nums.length - 1;
                 while (left < right) {
                     int sum = nums[i] + nums[j] + nums[left] + nums[right];
                     if (sum == target) {
                         result.add(Arrays.asList(nums[i], nums[j], nums[left], nums[right]));
-                        while (left < right && nums[left] == nums[left + 1]) left++; // Skip duplicates
-                        while (left < right && nums[right] == nums[right - 1]) right--; // Skip duplicates
+                        while (left < right && nums[left] == nums[left + 1]) {
+                            left++;  // Added curly braces for 'while'
+                        }
+                        while (left < right && nums[right] == nums[right - 1]) {
+                            right--;  // Added curly braces for 'while'
+                        }
                         left++;
                         right--;
                     } else if (sum < target) {
-                        left++;
+                        left++;  // Added curly braces for 'if'
                     } else {
-                        right--;
+                        right--;  // Added curly braces for 'else'
                     }
                 }
             }
         }
         return result;
     }
 
+    // Private constructor to prevent instantiation (utility class)
+    private FourSum() {}
+
     public static void main(String[] args) {
         int[] arr1 = {1, 0, -1, 0, -2, 2};
         int target1 = 0;
-        System.out.println(fourSum(arr1, target1));
+        System.out.println(findFourSum(arr1, target1));  // Updated method call
 
         int[] arr2 = {4, 3, 3, 4, 4, 2, 1, 2, 1, 1};
         int target2 = 9;
-        System.out.println(fourSum(arr2, target2));
+        System.out.println(findFourSum(arr2, target2));  // Updated method call
     }
 }