private static bool IsValid(PasswordCheck passwordCheck)
{
bool first = passwordCheck.Password.Length >= passwordCheck.First &&
passwordCheck.Password[passwordCheck.First - 1].ToString() == passwordCheck.Letter;
bool second = passwordCheck.Password.Length >= passwordCheck.Second &&
passwordCheck.Password[passwordCheck.Second - 1].ToString() == passwordCheck.Letter;
return(!(first && second) && (first || second));
}
private static bool IsValid(PasswordCheck passwordCheck)
{
int occurrences = passwordCheck.Password.Count(letter => letter.ToString() == passwordCheck.Letter);
return(occurrences >= passwordCheck.First && occurrences <= passwordCheck.Second);
}