interfaces.cs

class Player : Actor, IHealthy, IAttacker
{
    public float MaxHealth { get; }
    public float Health { get; private set; }
    public float AttackDamage { get; private set; }
    public void DealDamage(float damage)
    {
        Health = Mathf.Clamp(Health - damage, 0f, MaxHealth);
        if (Health == 0f)
        {
            Die();
        }
    }
    public void Heal(float amount)
    {
        Health = Mathf.Clamp(Health + amount, 0f, MaxHealth);
    }
    public void Die()
    {
        // do some stuff
    }
    public void Attack(IHealthy target)
    {
        target.DealDamage(AttackDamage);
    }
}

interface IHealthy
{
    float MaxHealth { get; }
    float Health { get; }
    void DealDamage(float damage);
    void Heal(float amount);
    void Die();
}

interface IAttacker
{
    float AttackDamage { get; }
    void Attack(IHealthy target);
}