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 searches 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 the chessboard.
File 8-print_diagsums.c is a function that prints the sum of the two diagonals of a square matrix of integers.
File 9-set_string.c is a function that sets the value of a pointer to a char.
File holberton.h is the header file with the functions prototypes.
File _putchar.c is the file that contains the _putchar function.