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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def get_class_name(class_key, classification_key):
 """Helper to get class name from a class_key of a classification. :param class_key: The key of the class. :type class_key: str :type classification_key: The key of a classification. :param classification_key: str :returns: The name of the class. :rtype: str """

    classification = definition(classification_key)
    for the_class in classification['classes']:
        if the_class.get('key') == class_key:
            return the_class.get('name', class_key)
    return class_key