from typing import List


def _make_both_cases(s: str) -> List[str]:
    """Capitalize and uncapitalize first letter of string. Original case first.

    Args:
        s, str.

    Return:
        list[str], capitalized and uncapitalized version of string.
    """
    if s:
        upper = s[:1].upper() + s[1:]
        lower = s[:1].lower() + s[1:]
        if upper == s:
            return [upper, lower]
        else:
            return [lower, upper]
    else:
        return [""]