camel to snake

Assignment name  : camel_to_snake
Expected files   : camel_to_snake.c
Allowed functions: malloc, free, realloc, write
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Write a program that takes a single string in lowerCamelCase format
and converts it into a string in snake_case format.

A lowerCamelCase string is a string where each word begins with a capital letter
except for the first one.

A snake_case string is a string where each word is in lower case, separated by
an underscore "_".

Examples:
$>./camel_to_snake "hereIsACamelCaseWord"
here_is_a_camel_case_word
$>./camel_to_snake "helloWorld" | cat -e
hello_world$
$>./camel_to_snake | cat -e
$

#include <unistd.h>

void	camel_to_snake(char *str)
{
	while (*str != '\0')
	{
		if (*str >= 'A' && *str <= 'Z')
		{
			write(1, "_", 1);
			*str = *str + ('a' - 'A');
		}
		write(1, str, 1);
		++str;
	}
}

int		main(int argc, char **argv)
{
	if (argc == 2)
		camel_to_snake(argv[1]);

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