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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 convert_camel_case_string(name: str) -> str: """Convert camel case string to snake case"""

    string = re.sub("(.)([A-Z][a-z]+)", r"\1_\2", name)
    return re.sub("([a-z0-9])([A-Z])", r"\1_\2", string).lower()