public string Brew(ref Can can) { if ((!FilterHolder.HasCleanFilterWithIngredient()) || (WaterMlAmount <= 0)) { return("Couldn't brew!"); } else { Brewage brewage = FilterHolder.Filter.PourWater(WaterMlAmount); can.FillWithBrewage(brewage); WaterMlAmount = 0; return($"{FilterHolder.Filter.IngredentName} was brewed in can."); } }