Added serveral helper function for parsing tariff file: * getPrepaid() * getCarryOver() * getService() * getOutOfService() Added main functions of tariff calculator: * ComputeDurationFromCost() * ComputeCostFromDuration()
Added serveral helper function for parsing tariff file: * getPrepaid() * getCarryOver() * getService() * getOutOfService() Added main functions of tariff calculator: * ComputeDurationFromCost() * ComputeCostFromDuration()