import re


class InvalidStringException(Exception):
    """Raised when a string cannot be converted to an integer."""
    pass


def convert_string_to_integer(data: str) -> int | Exception:
    """
    Converts a string to an integer value.
    :param data: A string containing an integer or float value to convert
    :return: The converted integer value or exception object

    Examples:
    >>> convert_string_to_integer("4")
    >>> convert_string_to_integer("3.0")
    """

    try:
        if '.' in data:
            return int(float(data))
        else:
            return int(data)
    except ValueError as exc:
        raise InvalidStringException("The string could not be converted to an integer.") from exc