def to_lower_camel_case(string):
    """
    Converts string to lower camel case.

    Args:
        string (str): input string in any case

    Returns:
        str: string converted to lower camel case

    Example:
        >>> to_lower_camel_case('snake_case_string')
        'snakeCaseString'
    """
    components = string.split('_')
    # lower first letter in the first component
    if components[0]:
        components[0] = components[0][0].lower() + components[0][1:]
    # join other components with first capitalized first letter
    return components[0] + ''.join(x.title() for x in components[1:])