style: fix indentation fully (no tabs)

Author: prashantpiyush1111

src/main/java/com/thealgorithms/datastructures/queues/ThreadSafeQueue.java

@@ -2,46 +2,47 @@
 
 public class ThreadSafeQueue<T> {
 
-	private static class Node<T> {
-		T data;
-		Node<T> next;
+    private static class Node<T> {
+        T data;
+        Node<T> next;
 
-		Node(T data) {
-			this.data = data;
-		}
-	}
+        Node(T data) {
+            this.data = data;
+        }
+    }
 
-	private Node<T> head;
-	private Node<T> tail;
+    private Node<T> head;
+    private Node<T> tail;
 
-	public synchronized void enqueue(T data) {
-		Node<T> newNode = new Node<>(data);
+    public synchronized void enqueue(T data) {
+        Node<T> newNode = new Node<>(data);
 
-		if (tail == null) {
-			head = tail = newNode;
-			return;
-		}
+        if (tail == null) {
+            head = newNode;
+            tail = newNode;
+            return;
+        }
 
-		tail.next = newNode;
-		tail = newNode;
-	}
+        tail.next = newNode;
+        tail = newNode;
+    }
 
-	public synchronized T dequeue() {
-		if (head == null) {
-			return null;
-		}
+    public synchronized T dequeue() {
+        if (head == null) {
+            return null;
+        }
 
-		T data = head.data;
-		head = head.next;
+        T data = head.data;
+        head = head.next;
 
-		if (head == null) {
-			tail = null;
-		}
+        if (head == null) {
+            tail = null;
+        }
 
-		return data;
-	}
+        return data;
+    }
 
-	public synchronized boolean isEmpty() {
-		return head == null;
-	}
+    public synchronized boolean isEmpty() {
+        return head == null;
+    }
 }