def camelcase_to_underscore(name):
s1 = re.sub('<STR_LIT>', r'<STR_LIT>', name)<EOL>return re.sub('<STR_LIT>', r'<STR_LIT>', s1).lower()<EOL>
Transform string from camelCase to underscore_string.

    :param name: string in camelcase
    :type name: str
    :return: string with underscores
    :rtype: str

    :Example:
        >>> camelcase_to_underscore('camelCase')
        'camel_case'