def nearest_child(parent_abspath, child_abspath):
    start = len(parent_abspath)+1 if parent_abspath else 0
    return child_abspath[start:].split('.', 1)[0]
Determine the relative name of the nearest child inside of the
dataset/ETHPy150Open OpenMDAO/OpenMDAO/openmdao/util/string_util.py/nearest_child