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

int func(char *str, size_t size) {
  char *temp = str;  /*str and temp reference same location */
  size_t i;
  for (i = 0; i < size-1; i++) temp[i] += 32;
  free(temp);
  return 0;
}

int main(void) {
  size_t size = 5;
  char *str = malloc(size);
  strncpy(str,"ABCD",size);
  printf("%s\n",str); /* 1st printing of str */
  func(str,size);
  return 0;
}