Update CircularDoublyLinkedListTest.java

lint issue fix

Author: richk21

src/test/java/com/thealgorithms/datastructures/lists/CircularDoublyLinkedListTest.java

@@ -53,10 +53,8 @@ public void testRemoveInvalidIndex() {
         list.append(10);
         list.append(20);
 
-        assertThrows(IndexOutOfBoundsException.class, () -> list.remove(2),
-                "Removing at invalid index 2 should throw exception.");
-        assertThrows(IndexOutOfBoundsException.class, () -> list.remove(-1),
-                "Removing at negative index should throw exception.");
+        assertThrows(IndexOutOfBoundsException.class, () -> list.remove(2), "Removing at invalid index 2 should throw exception.");
+        assertThrows(IndexOutOfBoundsException.class, () -> list.remove(-1), "Removing at negative index should throw exception.");
     }
 
     @Test
@@ -78,8 +76,7 @@ public void testSingleElement() {
 
     @Test
     public void testNullAppend() {
-        assertThrows(NullPointerException.class, () -> list.append(null),
-                "Appending null should throw NullPointerException.");
+        assertThrows(NullPointerException.class, () -> list.append(null), "Appending null should throw NullPointerException.");
     }
 
     @Test
@@ -122,3 +119,4 @@ public void testToStringAfterMultipleRemoves() {
     }
 
 }
+