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Delete all even parity nodes from circular linked list in swift

Swift program for Delete all even parity nodes from circular linked list. Here problem description and explanation.

import Foundation
// Swift 4 program for
// Remove all even parity nodes from a circular single linked list
class LinkNode
{
	var data: Int;
	var next: LinkNode? ;
	init(_ data: Int)
	{
		self.data = data;
		self.next = nil;
	}
}
class CircularLinkedList
{
	var head: LinkNode? ;
	var tail: LinkNode? ;
	init()
	{
		self.head = nil;
		self.tail = nil;
	}
	func insert(_ value: Int)
	{
		let node: LinkNode? = LinkNode(value);
		if (self.head == nil)
		{
			self.head = node;
		}
		else
		{
			self.tail!.next = node;
		}
		node!.next = self.head;
		self.tail = node;
	}
	// Display node element of circular linked list
	func display()
	{
		if (self.head == nil)
		{
			print("\n Empty Linked List");
		}
		else
		{
			print(" Linked List Element ");
			// First node of linked list
			print(" ",self.head!.data, terminator: " ");
			var temp: LinkNode? = self.head!.next;
			// Display linked list node
			while (temp  != nil && !(temp === self.head))
			{
				// Display node value
				print(" ",temp!.data, terminator: " ");
				// Visit to next node
				temp = temp!.next;
			}
		}
	}
	// Handles the request to find set bits in given integer
	func coutSetBit(_ num: Int) -> Int
	{
		var result: Int = num;
		result = result - ((result >> 1) & 1431655765);
		result = (result & 858993459) + ((result >> 2) & 858993459);
		result = (result + (result >> 4)) & 252645135;
		result = result + (result >> 8);
		result = result + (result >> 16);
		result = result & 63;
		return result;
	}
	func removeNode()
	{
		if (self.head == nil)
		{
			return;
		}
		var temp: LinkNode? = self.head;
		var auxiliary: LinkNode? = self.head;
		var point: LinkNode? = nil;
		while (temp  != nil)
		{
			if (self.coutSetBit(temp!.data) % 2 == 0)
			{
				auxiliary = temp;
				// Visit to next node
				temp = temp!.next;
				if (auxiliary === self.head)
				{
					// Remove head node
					if (auxiliary === self.tail)
					{
						// Removing a single node
						self.tail = nil;
						self.head = nil;
						temp = nil;
					}
					else
					{
						self.head = temp;
						self.tail!.next = temp;
					}
				}
				else if (auxiliary === self.tail)
				{
					if (point  != nil)
					{
						// When Remove last node
						point!.next = self.head;
					}
					self.tail = point;
				}
				else
				{
					if (point  != nil)
					{
						// When Remove last node
						point!.next = temp;
					}
				}
				auxiliary = nil;
			}
			else
			{
				point = temp;
				// Visit to next node
				temp = temp!.next;
				if (temp === self.head)
				{
					// Stop the process
					temp = nil;
				}
			}
		}
	}
	static func main(_ args: [String])
	{
		let cll: CircularLinkedList = CircularLinkedList();
		// Insert node
		cll.insert(3);
		cll.insert(12);
		cll.insert(32);
		cll.insert(14);
		cll.insert(27);
		cll.insert(19);
		cll.insert(1);
		cll.insert(18);
		print("\n Before Remove ");
		cll.display();
		/*
		    Node  Binary     Even Parity
		     3     (11)         Yes
		    12     (1100)       Yes
		    32     (100000)     No
		    14     (1110)       No
		    27     (11011)      Yes
		    19     (10011)      No
		    1         (1)       No        
		    18     (10010)      Yes
		*/
		cll.removeNode();
		print("\n\n After Remove");
		cll.display();
	}
}
CircularLinkedList.main([String]());

Output

 Before Remove
 Linked List Element
  3   12   32   14   27   19   1   18

 After Remove
 Linked List Element
  32   14   19   1




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