#include <stdio.h>
#include <string.h>
 
int get_token(const char *str, const char **start, const char **end)
{
	str += strspn(str, " \t\r\n");
	if (!str[0]) return 0;
 
	*start = *end = str;
 
	if (strchr("()", str[0]))
		*end += 1;
	else
		*end += strcspn(str, "() \t\r\n");
 
	return 1;
}
 
int main(void) {
	const char *input = "(define (add x y) (+ x y))";
	const char *token, *token_end = input;
 
	while(get_token(token_end, &token, &token_end))
	{
		printf("%.*s\n", (int)(token_end - token), token);
	}
 
	return 0;
}
 

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