Categorize the days of the week between weekdays and weekend.
Sunday, Monday, Tuesday, Wednesday, Thursday, Friday, Saturday
weekdays - Monday, Tuesday, Wednesday, Thursday, Friday
weekends - Saturday, Sunday
Categorize os dias da semana entre dias de semana e fim de semana.
dias úteis - segunda-feira, terça-feira, quarta-feira, quinta-feira, sexta-feira; fins de semana - sábado, domingo