GameManager.Awake C# (CSharp) Method

    void Awake()
    {
        if (instance != null)
        {
            Debug.LogError("More than one GameManager in scene.");
        } else
        {
            instance = this;
        }
    }

    public void Initialize()
    {
        GameObject gameObject1 = new GameObject();
        GameObject gameObject2 = new GameObject();
        GameObject gameObject3 = new GameObject();
        GameObject gameObject4 = new GameObject();

        gameManager = gameObject2.AddComponent <GameManager>();
        gameManager.Awake();
        enemy           = gameObject1.AddComponent <Enemy>();
        wall            = gameObject3.AddComponent <Wall>();
        player          = gameObject4.AddComponent <Player>();
        gameObject4.tag = "Player";

        soundManager   = gameObject1.AddComponent <SoundManager>();
        lowPitchRange  = gameObject1.AddComponent <SoundManager>();
        highPitchRange = gameObject1.AddComponent <SoundManager>();
    }