def correct_string(string, *args):
    if not args:
        return string
    elif len(args) == 1:
        return string.format(args[0])
    elif len(args) == 2:
        return string.format(args[0], args[1])
    elif len(args) == 3:
        return string.format(args[0], args[1], args[2])
    # (...)


b = "ale {} to ty {}"
print(correct_string(b, 'konto', 'usun'))