void Shoot()
{
if (canShoot &&
Input.GetKeyDown(KeyCode.Space))
{
GameObject bullet = Instantiate(prefabBullet, transform.position, transform.rotation) as GameObject;
PlayerBullet bulletScript = bullet.GetComponent <PlayerBullet>();
int dir = GetFaceDirection();
bulletScript.SetBulletSpeed(speed * dir);
canShoot = false;
}
}