0x08-recursion

File	Prototype
0-puts_recursion.c	void _puts_recursion(char *s);
1-print_rev_recursion.c	void _print_rev_recursion(char *s);
2-strlen_recursion.c	int _strlen_recursion(char *s);
3-factorial.c	int factorial(int n);
4-pow_recursion.c	int _pow_recursion(int x, int y);
5-sqrt_recursion.c	int _sqrt_recursion(int n);
6-is_prime_number.c	int is_prime_number(int n);
7-is_palindrome.c	int is_palindrome(char *s);
100-wildcmp.c	int wildcmp(char *s1, char *s2);