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

int main() {

  /* Task:
   * Concatenate World! to hello[32]
   * Cut of garbage.
   * Assume "World!" is variable length
   */

  char *world = "World! garbage";
  char hello[32] = "Hello ";

#ifdef TRY1
  // works, but... meh.
  char buf[32] = "";
  char *cutlen = "6";
  char fmt[5] = "";
  strlcat(fmt, "%.", sizeof(fmt));
  strlcat(fmt, cutlen, sizeof(fmt));
  strlcat(fmt, "s", sizeof(fmt));
  snprintf(buf, sizeof(buf), fmt, world);
  strlcat(hello, buf, sizeof(hello));
  printf("%s\n", hello);
#endif

#ifdef TRY2
  // - copy string
  // - inject \0 at cutoff point
  char buf[32] = "";
  strlcpy(buf, world, sizeof(buf));
  char *ptr = &buf[0] + 7;
  *ptr = '\0';
  strlcat(hello, buf, sizeof(hello));
  printf("%s\n", hello);
#endif

  return 0;
}