How do I to know on which GameObject I clicked?

I want to make a Memory Game. When the PC player clicks in a card, the game needs to call the function memory(GameObject card). My code is:

 using System.Collections;
 using System.Collections.Generic;
 using UnityEngine;
 
 public class memoria : MonoBehaviour
 {
 
     private int counterOverturnedCards = 0;
     private GameObject[] overturnedCards = new GameObject[2];
 
     // Start is called before the first frame update
     void Start()
     {
         
     }
 
     // Update is called once per frame
     void Update()
     {
         
     }
 
     void memory(GameObject card)
     {
         if (card.GetComponent<SpriteRenderer>().sprite == Resources.Load<Sprite>("Assets/Card/card.png"))
         {
             if (card == GameObject.Find("Cards/card10") || card == GameObject.Find("Cards/card20"))
             {
                     card.GetComponent<SpriteRenderer>().sprite = Resources.Load<Sprite>("Assets/Card/krunk.png");
                     overturnedCards[counterOverturnedCards] = card;
                     counterOverturnedCards++;
             }
             else if (card == GameObject.Find("Cards/card03") || card == GameObject.Find("Cards/card21"))
             {
                     card.GetComponent<SpriteRenderer>().sprite = Resources.Load<Sprite>("Assets/Card/nash.png");
                     overturnedCards[counterOverturnedCards] = card;
                     counterOverturnedCards++;
             }
             else if (card == GameObject.Find("Cards/card05") || card == GameObject.Find("Cards/card13"))
             {
                     card.GetComponent<SpriteRenderer>().sprite = Resources.Load<Sprite>("Assets/Card/geary.png");
                     overturnedCards[counterOverturnedCards] = card;
                     counterOverturnedCards++;
             }
             else if (card == GameObject.Find("Cards/card04") || card == GameObject.Find("Cards/card24"))
             {
                     card.GetComponent<SpriteRenderer>().sprite = Resources.Load<Sprite>("Assets/Card/mixvelo.png");
                     overturnedCards[counterOverturnedCards] = card;
                     counterOverturnedCards++;
             }
             else if (card == GameObject.Find("Cards/card06") || card == GameObject.Find("Cards/card18"))
             {
                     card.GetComponent<SpriteRenderer>().sprite = Resources.Load<Sprite>("Assets/Card/small_norm.png");
                     overturnedCards[counterOverturnedCards] = card;
                     counterOverturnedCards++;
             }
             else if (card == GameObject.Find("Cards/card12") || card == GameObject.Find("Cards/card22"))
             {
                     card.GetComponent<SpriteRenderer>().sprite = Resources.Load<Sprite>("Assets/Card/big_norm.png");
                     overturnedCards[counterOverturnedCards] = card;
                     counterOverturnedCards++;
             }
             else if (card == GameObject.Find("Cards/card01") || card == GameObject.Find("Cards/card14"))
             {
                     card.GetComponent<SpriteRenderer>().sprite = Resources.Load<Sprite>("Assets/Card/emperor_velo_xxvii.png");
                     overturnedCards[counterOverturnedCards] = card;
                     counterOverturnedCards++;
             }
             else if (card == GameObject.Find("Cards/card08") || card == GameObject.Find("Cards/card17"))
             {
                     card.GetComponent<SpriteRenderer>().sprite = Resources.Load<Sprite>("Assets/Card/real_velo.png");
                     overturnedCards[counterOverturnedCards] = card;
                     counterOverturnedCards++;
             }
             else if (card == GameObject.Find("Cards/card07") || card == GameObject.Find("Cards/card19"))
             {
                     card.GetComponent<SpriteRenderer>().sprite = Resources.Load<Sprite>("Assets/Card/n_trance.png");
                     overturnedCards[counterOverturnedCards] = card;
                     counterOverturnedCards++;
             }
             else if (card == GameObject.Find("Cards/card09") || card == GameObject.Find("Cards/card15"))
             {
                     card.GetComponent<SpriteRenderer>().sprite = Resources.Load<Sprite>("Assets/Card/zam.png");
                     overturnedCards[counterOverturnedCards] = card;
                     counterOverturnedCards++;
             }
             else if (card == GameObject.Find("Cards/card11") || card == GameObject.Find("Cards/card16"))
             {
                     card.GetComponent<SpriteRenderer>().sprite = Resources.Load<Sprite>("Assets/Card/zem.png");
                     overturnedCards[counterOverturnedCards] = card;
                     counterOverturnedCards++;
             }
             else if (card == GameObject.Find("Cards/card02") || card == GameObject.Find("Cards/card23"))
             {
                     card.GetComponent<SpriteRenderer>().sprite = Resources.Load<Sprite>("Assets/Card/nitros_oxide.png");
                     overturnedCards[counterOverturnedCards] = card;
                     counterOverturnedCards++;
             }
         }
         if (overturnedCards[0] != overturnedCards[1])
         {
             StartCoroutine(waitTwoSeconds());
             overturnedCards[0].GetComponent<SpriteRenderer>().sprite = Resources.Load<Sprite>("Assets/Card/card.png");
             overturnedCards[1].GetComponent<SpriteRenderer>().sprite = Resources.Load<Sprite>("Assets/Card/card.png");
         }
         if (counterOverturnedCards == 2) counterOverturnedCards = 0;
     }
 
     IEnumerator waitTwoSeconds()
     {
         yield return new WaitForSeconds(2);
     }
 }