File 0-memset.c is a function that fills memory with a constant byte.
File 1-memcpy.c is a function that copies memory area.
File 2-strchr.c is a function that locates a character in a string.
FILE 3-strspn.c is a function that gets the length of a prefix substring.
FILE 4-strpbrk.c is a function that seraches a string for any of a set of bytes.
FILE 5-strstr.c is a function that locates a substring.
FILE 7-print_chessboard.c is a function that prints a chessboard.
File _putchar is a function that replaces the standard library function putchar().
FILE 8-print_diagsums.c is a function that prints the sum of the two diagonals of a square matrix of integers.
FILE 100-set_string.c is a function taht sets the value of a pointer to a char.
FILE 101-crackme_password contains the password for the crackme2 executable.