Redshire/learnc — pull request #1 by Redshire (2014-04-06 18:25:40+00:00)
Title: create blank.c

* Write the function htoi(s), which converts a string of hexadecimal
* digits (including an optional 0x or 0X) into its equivalent integer
* value. The allowable digits are 0 through 9, a through f, and A
* through F.