Chess pieces moving animation

Hi everyone!
I've been working on a chess game and I'd like to add moving animation. Partially I achieved my goal by creating a script, but I have no idea how to add easing curve. Here is the code:

Code (CSharp):

1. using UnityEngine;
2.  
3. public class ChessPieceMovingAnimation : MonoBehaviour
4. {
5.     public float duration = 0.25f;
6.  
7.     private bool isXEqualZero;
8.     private Vector3 destination = Vector3.zero;
9.     private Vector3 move = Vector3.zero;
10.  
11.     public void SetDestination(float x, float y, float z)
12.     {
13.         destination = new Vector3(x, y, z);
14.     }
15.  
16.     private void OnEnable()
17.     {
18.         move = destination - transform.position;
19.         isXEqualZero = move.x == 0 ? true : false;
20.     }
21.    
22.     private void Update()
23.     {
24.         transform.position = transform.position + move / duration * Time.deltaTime;
25.  
26.         if (!isXEqualZero)
27.         {
28.             if (move.x > 0 && transform.position.x >= destination.x)
29.             {
30.                 transform.position = destination;
31.                 enabled = false;
32.             }
33.             else if (move.x < 0 && transform.position.x <= destination.x)
34.             {
35.                 transform.position = destination;
36.                 enabled = false;
37.             }
38.         }
39.         else
40.         {
41.             if (move.y > 0 && transform.position.y >= destination.y)
42.             {
43.                 transform.position = destination;
44.                 enabled = false;
45.             }
46.             else if (move.y < 0 && transform.position.y <= destination.y)
47.             {
48.                 transform.position = destination;
49.                 enabled = false;
50.             }
51.         }
52.     }
53. }
54.