Assignment name  : search_and_replace
Expected files   : search_and_replace.c
Allowed functions: write, exit

Write a program called search_and_replace that takes 3 arguments, the first 
arguments is a string in which to replace a letter (2nd argument) by
another one (3rd argument).

If the number of arguments is not 3, just display a newline.

If the second argument is not contained in the first one (the string)
then the program simply rewrites the string followed by a newline.

$>./search_and_replace "My life for Aizr" "z" "u"
My life for Aiur
$>./search_and_replace "gaetan" "art" "zul" | cat -e
$>./search_and_replace "zaz" "r" "u" | cat -e
$>./search_and_replace "jacob" "a" "b" "c" "e" | cat -e
$>./search_and_replace "In foct, stoff crew ore very nice. They like metol." "o" "a" | cat -e
In fact, staff crew are very nice. They like metal.$

#include <unistd.h>

void	search_and_replace(char *str, char target, char replacement)
	while (*str != '\0')
		if (*str == target)
			write(1, &replacement, 1);
			write(1, str, 1);

int		main(int argc, char **argv)
	if (argc == 4 && argv[2][1] == '\0' && argv[3][1] == '\0')
		search_and_replace(argv[1], argv[2][0], argv[3][0]);

	write(1, "\n", 1);
	return (0);