```
def add_zero(array):
    zero_indices = [i for i, x in enumerate(array) if x == 0]
    for index in zero_indices:
        array.insert(index + 1, 0)
    return array
```
def add_zero(array):
    zero_indices = [i for i, x in enumerate(array) if x == 0]
    for index in zero_indices:
        array.insert(index + 1, 0)
    return array