10. Multiply Evens by Odds

package methods;

import java.util.Arrays;
import java.util.Scanner;

public class P10MultiplyEvensByOdds {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);

        int num = Math.abs(Integer.parseInt(scanner.nextLine()));

        System.out.println(multiply(num));
    }

    public static int multiply(int num) {
        return evenSum(num) * oddSum(num);
    }

    public static int evenSum(int num) {
        String intToString = Integer.toString(num);

        int[] arr = Arrays.stream(intToString.split(""))
                .mapToInt(Integer::parseInt)
                .toArray();

        int sum = 0;
        for (int n : arr) {
            if (n % 2 == 0) {
                sum += n;
            }
        }

        return sum;
    }

    public static int oddSum(int num) {
        String intToString = Integer.toString(num);

        int[] arr = Arrays.stream(intToString.split(""))
                .mapToInt(Integer::parseInt)
                .toArray();

        int sum = 0;
        for (int n : arr) {
            if (n % 2 != 0) {
                sum += n;
            }
        }

        return sum;
    }
}