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// Основная логика расчета
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class FuelCalculator {
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  static double calculateConsumption(double fuelUsed, double distance) {
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    return (fuelUsed / distance) * 100; // л/100км
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  }
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  static double calculateTripCost(double distance, double consumption, double price) {
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    return (distance / 100) * consumption * price;
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  }
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}
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// Пример виджета ввода
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class FuelInputField extends StatelessWidget {
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  @override
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  Widget build(BuildContext context) {
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    return TextField(
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      keyboardType: TextInputType.number,
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      decoration: InputDecoration(
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        labelText: 'Потрачено топлива (л)',
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        icon: Icon(Icons.local_gas_station),
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      ),
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    );
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  }
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}