What might be the problem

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1

Hi. I am a beginner and I collect scripts from websites or use chatgpt, so I would like to ask what the problem with the script could be.

The script should work in such a way that there is a projectile that shoots from where the player is, it shoots as many times as I press the left click, the projectile should be deleted every 3 seconds, the projectile should only be able to move along the y-axis.
I wrote 2 scripts.

WeaponScript.cs

using UnityEngine;

public class WeaponScript : MonoBehaviour
{
    public GameObject bulletPrefab;
    public Transform firePoint;

    private void Update()
    {
        if (Input.GetMouseButtonDown(0))
        {
            // Lövedék kilövése, amikor a bal egérgombot lenyomják
            Shoot();
        }
    }

    private void Shoot()
    {
        // Lövedék példányosítása és kilövése
        if (firePoint != null)
        {
            GameObject bullet = Instantiate(bulletPrefab, firePoint.position, Quaternion.identity);
            Destroy(bullet, 3f);
        }
    }
}

BulletController

using UnityEngine;

public class BulletController : MonoBehaviour
{
    public float speed = 10f;
    public float lifespan = 3f;

    private float timer;

    private void Start()
    {
        timer = lifespan;
    }

    private void Update()
    {
        // A lövedék felfelé mozog
        transform.Translate(Vector3.up * speed * Time.deltaTime);

        // Időzítő a lövedék élettartamához
        timer -= Time.deltaTime;
        if (timer <= 0f)
        {
            Destroy(gameObject);
        }
    }

    private void OnTriggerEnter(Collider other)
    {
        // Ellenőrizd, hogy a lövedék más tárgyhoz ért-e
        // Itt kapsz alkalmat a karakter követésére vagy bármilyen más tevékenységre
    }
}

please help or give me some advice