public IActionResult CheckGroupValidity(string groupName)
        {
            if (_bGroup.IsValidGroup(groupName))
            {
                return(Ok());
            }

            return(NotFound());
        }
 public IActionResult UserInGroup(string username, string groupName)
 {
     if (!_bUser.IsValidUser(username) || !_bGroup.IsValidGroup(groupName))
     {
         return(BadRequest());
     }
     if (_bGroup.IsUserGroupMember(groupName, username))
     {
         return(Ok());
     }
     return(NotFound());
 }