public List <TimePoint> CalculateAvailableSlots(int durationMinute)
{
List <TimePoint> result = new List <TimePoint>();
int freeTimeDuration = GetDurationMinute();
int numberOfSlot = freeTimeDuration / durationMinute;
int remainderMinutes = freeTimeDuration % durationMinute; //Split from the bottom
for (int i = 0; i < numberOfSlot; i++)
{
result.Add(Start.AddMinute(i * durationMinute + remainderMinutes));
}
return(result);
}