AO LO ZIPA

//*************** THE TESTS ******************//
int[] arr = {0,1,0,3,12};
        int[] arr2 = {0,0,1,2,3};

        int[] arr3 = {2,3,1,0,0};
        int[] arr4 = {9,0,8,7,0};

        printArr(takeZeroToTheEnd(arr));
        System.out.println("\n");
        printArr(takeZeroToTheEnd(arr2));
        System.out.println("\n");
        printArr(takeZeroToTheEnd(arr3));
        System.out.println("\n");
        printArr(takeZeroToTheEnd(arr4));

// ************* THE CODE ******************//

public static int[] takeZeroToTheEnd(int[] arr) {
        int guardIndex = 0;
        int temp1 = 0;
        int countZero = 0;

        for (int i = 0; i < arr.length -1; i++) {
            countZero++;
        }
        for (int i = 0; i < arr.length; i++) {
            System.out.println(i);
            if (arr[i] != 0) {
                temp1 = arr[i];
                arr[guardIndex] = temp1;
                guardIndex++;
            }
        }
        for (int i = arr.length-1; i > arr.length - countZero+1 ; i--) {
            arr[i] = 0;
        }
        return arr;
    }


/// ******************** THE GAV ***********************//
    YOU!