<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def object_as_axis(arr, dtype, axis=-1):
 """ cast an array of void objects to a typed axis Parameters arr : ndarray, [ndim], void array of type np.void dtype : numpy dtype object the output dtype to cast the input array to axis : int position to insert the newly formed axis into Returns ------- ndarray, [ndim+1], dtype output array cast to given dtype """

    # view the void objects as typed elements
    arr = arr.view(dtype).reshape(arr.shape + (-1,))
    # put the axis in the specified location
    return np.rollaxis(arr, -1, axis)