/* isp RemoveFormation()
*
* Input variables:
* battleFormation =
*
* State variables:
*
*
*/
public void RemoveFormation(BattleFormation battleFormation)
{
if (battleFormation is null)
{
throw new ArgumentNullException(nameof(BattleFormation));
}
var formations = Formations.Where(f => f.Equals(battleFormation));
if (formations == null || formations.Count() == 0)
{
throw new ArgumentException("Battle formation does not exist");
}
Formations.Remove(battleFormation);
}