Unity : How to save game data in bin format at runtime by serializing objects ?

SaveSystem.cs

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


using System.IO;
using System.Runtime.Serialization.Formatters.Binary;

public static class SaveSystem
{
    public static void Save(StoringDataInBinary d)
    {
        BinaryFormatter formatter = new BinaryFormatter();
        string path = Application.persistentDataPath + "/player.fun";
        FileStream stream = new FileStream(path, FileMode.Create);

        StoreDataExample data = new StoreDataExample(d);
        formatter.Serialize(stream, data);
        stream.Close();
    }

    public static StoreDataExample Load()
    {
        string path = Application.persistentDataPath + "/player.fun";
        if(File.Exists(path))
        {
            BinaryFormatter formater = new BinaryFormatter();
            FileStream stream = new FileStream(path, FileMode.Open);

            StoreDataExample data = formater.Deserialize(stream) as StoreDataExample;
            stream.Close();

            return data;
        }
        else
        {
            Debug.LogError("MY Save file not found in " + path);
            return null;
        }

    }
}


[System.Serializable]
public class StoreDataExample
{
    public int level;
    public int health;
    public float[] position;
    public float[] rotation;

    public StoreDataExample(StoringDataInBinary stb)
    {
        level = stb.level;
        health = stb.healt;
        

        position = new float[3];
        position[0] = stb.transform.position.x;
        position[1] = stb.transform.position.y;
        position[2] = stb.transform.position.z;

        rotation = new float[3];
        rotation[0] = stb.transform.localEulerAngles.x;
        rotation[1] = stb.transform.localEulerAngles.y;
        rotation[2] = stb.transform.localEulerAngles.z;

    }
}

public class StoringDataInBinary : MonoBehaviour
{

    public int level;
    public int healt;


    // Start is called before the first frame update
    void Start()
    {
        Debug.Log("Files saved at!");
        Debug.Log(Application.persistentDataPath);
        Load();
    }


    private void Load()
    {
        StoreDataExample ex = SaveSystem.Load();
        if (ex != null)
        {
            transform.position = new Vector3(ex.position[0], ex.position[1], ex.position[2]);
            transform.localEulerAngles = new Vector3(ex.rotation[0], ex.rotation[1], ex.rotation[2]);
        }
    }

    // Update is called once per frame
    void Update()
    {
        if (Input.GetKey(KeyCode.V))
        {
            SaveSystem.Save(this);
        }

        if (Input.GetKey(KeyCode.B))
        {
            Load();
        }
    }
}