Create a function which returns the total of all odd numbers up to and including n. n will be given as an odd number.
add_odd_to_n(5) ➞ 9
# 1 + 3 + 5 = 9
add_odd_to_n(13) ➞ 49
add_odd_to_n(47) ➞ 576
Curiously, the answers are all square numbers!