public string ManufactureFighter(string name, double attackPoints, double defensePoints) { if (machineRepository.Contains(name)) { return(string.Format(OutputMessages.MachineExists, name)); } Fighter fighter = new Fighter(name, attackPoints, defensePoints); machineRepository.Add(fighter); return(string.Format(OutputMessages.FighterManufactured, name, fighter.AttackPoints, fighter.DefensePoints, fighter.AggressiveModeToString())); }