CakeWallet/lib/entities/calculate_fiat_amount.dart

String calculateFiatAmount({double? price, String? cryptoAmount}) {
  if (price == null || cryptoAmount == null) {
    return '0.00';
  }

  cryptoAmount = cryptoAmount.replaceAll(',', '.');
  
  final _amount = double.parse(cryptoAmount);
  final _result = price * _amount;
  final result = _result < 0 ? _result * -1 : _result;

  if (result == 0.0) {
    return '0.00';
  }

  var formatted = '';
  final parts = result.toString().split('.');
  
  if (parts.length >= 2) {
    if (parts[1].length > 2) {
      formatted = parts[0] + '.' + parts[1].substring(0, 2);
    } else {
      formatted = parts[0] + '.' + parts[1];
    }
  }

  return result > 0.01 ? formatted : '< 0.01';
}