public IEnumerable <Diploma> GetCoachDiplomas()
{
if (!HasCoachDiploma())
{
return(null);
}
return(Coach
.Split(new[] { ';', ',' }, StringSplitOptions.RemoveEmptyEntries)
.Select(coach => CreateDiploma(name: coach.Trim(), text: null, type: null))
.ToList());
}