HelloWorld.cs

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

public class HelloWorld : MonoBehaviour
{
    // Start is called before the first frame update
    void Start()
    {
        Debug.Log("Hello World (start)");
        myCode();
    }
    

    // Update is called once per frame
    void Update()
    {
        //Debug.Log("Update Me.");
    }

    private void OnCollisionEnter(Collision collision)
    {
        myCode();
    }

    void myCode()   // myCode() Prints something to unity console
    {
        Debug.Log("My Function runs correctly");
    }
}