private List<TeamData> GetTeams()
        {
            using (Stream stream = File.OpenRead("teams.xlsx"))
            {
                TeamsExcelProvider excelProvider = new TeamsExcelProvider();

                return excelProvider.GetTeams(stream);
            }
        }
        private static List<TeamData> GetTeams(string excelPath)
        {
            using (Stream stream = File.OpenRead(excelPath))
            {
                TeamsExcelProvider excelProvider = new TeamsExcelProvider();

                return excelProvider.GetTeams(stream);
            }
        }