#include <stdio.h>
#include <string.h>

int starts_with(const char *string, const char *prefix)
{
	while(*prefix)
	{
		if(*prefix++ != *string++)
			return 0;
	}
	return 1;
}

int main(void) {
	printf("foo prefix of foobar? %d\n", starts_with("foobar", "foo"));
	printf("foobar prefix of foo? %d\n", starts_with("foo", "foobar"));
	return 0;
}