L02u12CurrencyConverter v2

import java.util.Scanner;

public class Uprajnenie02_12 {
    public static void main(String[] args) {

        Scanner scan = new Scanner(System.in);

        double cash = Double.parseDouble(scan.nextLine());
        String startingCuracy = scan.nextLine().toUpperCase();
        String convertToCuracy = scan.nextLine().toUpperCase();
        double cashConverted = convert(cash, startingCuracy, convertToCuracy, true);

        System.out.printf("%.2f %s", cashConverted, convertToCuracy);
    }

    static double convert(double value, String startCuracy, String endCuracy, boolean isStart) {
        final double toUsd = 1.79549;
        final double toEur = 1.95583;
        final double toGbp = 2.53405;

        String curancy = isStart ? startCuracy : endCuracy;
        switch (curancy) {
            case "BGN":
                break;
            case "USD":
                value = multiplyOrDivide(value, toUsd, isStart);
                break;
            case "EUR":
                value = multiplyOrDivide(value, toEur, isStart);
                break;
            case "GBP":
                value = multiplyOrDivide(value, toGbp, isStart);
        }

        return isStart ? convert(value, startCuracy, endCuracy, !isStart) : value;
    }

    private static double multiplyOrDivide(double value, double modifier, boolean isMultiplying) {
        return isMultiplying ? value * modifier : value / modifier;
    }
}