Creates an empty exercise Excel file.
See also
Other support functions:
create_exercise_csv(),
create_exercise_data_frame(),
read_exercise_csv(),
read_exercise_excel(),
set_pending_answers(),
vector_to_string(),
write_exercise_csv()
Examples
# \donttest{
file <- create_exercise_excel(file = tempfile(fileext = '.xlsx'))
# }
