good.c 254 Bytes

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

char* itoa(int a)
{
  char * buf = (char*)malloc(20);
  snprintf(buf,20,"%d", a);
  return buf;
}

int main()
{
  char *w1, *w2;
  printf("%s %s\n",w1=itoa(17), w2=itoa(15));
  free(w1);
  free(w2);
  return 0;
}