public interface IMoneyGiver
    {
        void GiveMoney();
    }

    public interface IDamageDealer
    {
        void DealDamage();
    }

    public interface IEntity : IMoneyGiver, IDamageDealer
    {

    }

    public class Entity : IEntity
    {
        private IMoneyGiver _moneyGiver = new DefaultMoneyGiver();
        private IDamageDealer _damageDealer = new DefaultDamageDealer();

        public void GiveMoney()
        {
            _moneyGiver.GiveMoney();
        }

        public void DealDamage()
        {
            _damageDealer.DealDamage();
        }
    }