Hey Guys I want my player to lose one Heartcontainer if he collides with the enemy

using System.Collections; using System.Collections.Generic; using UnityEngine; using UnityEngine.UI;

public class Health : MonoBehaviour { public int health; public int numOfHearts;

 public Image[] hearts;
 public Sprite fullHeart;
 public Sprite emptyHeart;
 public void damage(int n) //n represents the health number the player is going to lose
 {
     //TODO
 }

 public void ReFill(int n) //n represents the health number the player is going to gain
 {
     //TODO
 }

 public Collider player_co;

 private void Start()
 {
     player_co = GetComponent<Collider>();
 }

 private void  OnCollisionEnter2D(Collision2D other)
 {
     if (other.gameObject.tag.Equals("Enemy"))
     {
         damage(1);
     }
 }

  
 void Update()
 {

     if (health>numOfHearts) {
         health = numOfHearts;
     }
     for (int i=0;i< hearts.Length; i++) {
        
         if(i < health)
         {
             hearts[i].sprite = fullHeart;
         }
         else { hearts[i].sprite = emptyHeart; }
         if (i < numOfHearts)
         {
             hearts[i].enabled = true;
         }
         else {
             hearts[i].enabled = false;
         }
     }
 }

},