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

int main() {
    char *s = strdup("this is a test");
    char *deletemelater = s;
    const char *delim = " ";
    char *token;
    while(s) {
        token = strsep(&s, delim);
        puts(token);
        if (s) puts(s);
    }

    free(deletemelater);
}