public IActionResult GetCommandersGroups(string cmdrName)
        {
            if (string.IsNullOrWhiteSpace(cmdrName))
            {
                return(NotFound());
            }

            var existingGroups = _groupRepoz.GetByCommander(cmdrName).ToList();

            if (existingGroups.Any())
            {
                return(Ok(existingGroups));
            }

            var defaultGroup = _groupRepoz.GetDefaultGroup();

            _groupRepoz.AddCommanderToGroup(defaultGroup, cmdrName);

            return(Ok(new List <Group> {
                defaultGroup
            }));
        }