style: resolve some FCBL_FIELD_COULD_BE_LOCAL warnings

src/main/java/com/thealgorithms/datastructures/graphs/Cycles.java

@@ -6,7 +6,6 @@
 class Cycle {
 
     private final int nodes;
-    private final int edges;
     private int[][] adjacencyMatrix;
     private boolean[] visited;
     ArrayList<ArrayList<Integer>> cycles = new ArrayList<ArrayList<Integer>>();
@@ -16,7 +15,7 @@ class Cycle {
         System.out.print("Enter the no. of nodes: ");
         nodes = in.nextInt();
         System.out.print("Enter the no. of Edges: ");
-        edges = in.nextInt();
+        final int edges = in.nextInt();
 
         adjacencyMatrix = new int[nodes][nodes];
         visited = new boolean[nodes];

src/main/java/com/thealgorithms/others/CRCAlgorithm.java

@@ -25,8 +25,6 @@ public class CRCAlgorithm {
 
     private ArrayList<Integer> message;
 
-    private ArrayList<Integer> dividedMessage;
-
     private ArrayList<Integer> p;
 
     private Random randomGenerator;
@@ -44,7 +42,6 @@ public CRCAlgorithm(String str, int size, double ber) {
         messageChanged = false;
         message = new ArrayList<>();
         messSize = size;
-        dividedMessage = new ArrayList<>();
         p = new ArrayList<>();
         for (int i = 0; i < str.length(); i++) {
             p.add(Character.getNumericValue(str.charAt(i)));
@@ -103,7 +100,6 @@ public int getCorrectMess() {
     public void refactor() {
         messageChanged = false;
         message = new ArrayList<>();
-        dividedMessage = new ArrayList<>();
     }
 
     /**
@@ -156,7 +152,7 @@ public void divideMessageWithP(boolean check) {
                 }
             }
         }
-        dividedMessage = (ArrayList<Integer>) x.clone();
+        ArrayList<Integer> dividedMessage = (ArrayList<Integer>) x.clone();
         if (!check) {
             message.addAll(dividedMessage);
         } else {

src/main/java/com/thealgorithms/sorts/LinkListSort.java

@@ -259,14 +259,12 @@ static int count(Node head) {
 
 class Task2 {
 
-    private int[] a;
-
     public Node sortByHeapSort(Node head) {
         if (head == null || head.next == null) {
             return head;
         }
         int c = count(head);
-        a = new int[c];
+        int[] a = new int[c];
         // Array of size c is created
         int i = 0;
         for (Node ptr = head; ptr != null; ptr = ptr.next) {

src/test/java/com/thealgorithms/ciphers/a5/A5CipherTest.java

@@ -9,14 +9,12 @@
 public class A5CipherTest {
 
     private A5Cipher a5Cipher;
-    private BitSet sessionKey;
-    private BitSet frameCounter;
 
     @BeforeEach
     void setUp() {
         // Initialize the session key and frame counter
-        sessionKey = BitSet.valueOf(new long[] {0b1010101010101010L});
-        frameCounter = BitSet.valueOf(new long[] {0b0000000000000001L});
+        final var sessionKey = BitSet.valueOf(new long[] {0b1010101010101010L});
+        final var frameCounter = BitSet.valueOf(new long[] {0b0000000000000001L});
         a5Cipher = new A5Cipher(sessionKey, frameCounter);
     }
 

src/test/java/com/thealgorithms/ciphers/a5/A5KeyStreamGeneratorTest.java

@@ -12,15 +12,14 @@
 public class A5KeyStreamGeneratorTest {
 
     private A5KeyStreamGenerator keyStreamGenerator;
-    private BitSet sessionKey;
     private BitSet frameCounter;
 
     @BeforeEach
     void setUp() {
         keyStreamGenerator = new A5KeyStreamGenerator();
 
         // Initialize session key and frame counter for testing
-        sessionKey = BitSet.valueOf(new long[] {0b1010101010101010L}); // Example 16-bit key
+        final var sessionKey = BitSet.valueOf(new long[] {0b1010101010101010L}); // Example 16-bit key
         frameCounter = BitSet.valueOf(new long[] {0b0000000000000001L}); // Example 16-bit frame counter
         keyStreamGenerator.initialize(sessionKey, frameCounter);
     }