pset1 exercises
given the height (max 8), draws a pyramyd. E.g.: given a height of 8, will print:
# #
## ##
### ###
#### ####
##### #####
###### ######
####### #######
######## ########
given a card (debit or credit) number, it reports whenever is a VALID number and, if so, also report if it's an "AMEX", "VISA" or "MASTERCARD" number.
e.g.:
$ ./credit
Number: 4003600000000014
VISA"