just an example how to use strtok

strtok

/* % ./a.out "hello, world. this is an example" ".,"
 * hello
 *  world
 *  this is an example
 */

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

int main(int argc, char **argv)
{
	if (argc < 3)
		return fprintf(stderr, "Usage: %s <input> <tokens>\n", argv[0]);

	for (char *ptr = strtok(argv[1], argv[2]); ptr; ptr = strtok(NULL, argv[2]))
		printf("%s\n", ptr);

	return 0;
}