Не могу понять как оформить return

public class Solution {
    public static void main(String[] args) {
        System.out.println(sumDigitsInNumber(546));
    }

    public static int sumDigitsInNumber(int number) {
        double a = number / 100;
        int b =(int)Math.round(a);
        //b = 5
        int c = number / 100;
        int v =(int)Math.round(c);
        int n = v * 100;
        int f = number - n;
        int g = f / 10;
        int o =(int)Math.round(g);
        //o = 4
        int l = number / 100;
        int k =(int)Math.round(l);
        int y = k * 100;
        int i = number - y;
        int r = i / 10;
        int p =(int)Math.round(r);
        int h = r * 10;
        int st = i - h;
        //st = 6
        return ?????
    }
}