Task 1 – Refactoring to a pure function

Steve’s tower defense game calculates damage based on a global difficulty modifier. Refactor this function to make it pure:

public double _difficultyModifier = 1.0;
public double CalculateDamage(Tower tower, Enemy enemy)
{
     return tower.BaseDamage * enemy.DamageMultiplier * _difficultyModifier;
}