Given a fixed length array `arr`

of integers, duplicate each occurrence of zero, shifting the remaining elements to the right.

Note that elements beyond the length of the original array are not written.

Do the above modifications to the input array **in place**, do not return anything from your function.

## Examples

Example1:

```
Input: [1,0,2,3,0,4,5,0]
Output: null
Explanation: After calling your function, the input array is modified to: [1,0,0,2,3,0,0,4]
```

Example2:

```
Input: [1,2,3]
Output: null
Explanation: After calling your function, the input array is modified to: [1,2,3]
```

## Writing the code

```
# declare our function
def duplicateZeros(arr):
# create our incrementor
i = 0
# loop through all dynamic elements
while i < len(arr)-1:
# if the character is a zero
if arr[i]==0:
# remove the last item from the array
arr.pop()
# insert a zero in front of current element
arr.insert(i+1, 0)
# move one place forward
i += 1
# increment to the next character
i += 1
```