int[] hello = new int[] {1, 2, 3};
        int[] world = new int[] {4, 5, 6};
        int[] zawarudo = new int[hello.length + world.length];

        // SHIEEEET
        int counter = 0;
        for (int j = 0;j < hello.length; j++) {
            zawarudo[counter] = hello[j];
            counter++;
        }
        for (int j = 0;j < world.length; j++) {
            zawarudo[counter] = world[j];
            counter++;
        }