Using typedef definitions

/* 1803.c: Using typedef definitions */
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

enum constants{ITEM_NUM = 3,DELT='a'-'A'};
typedef char *STRING[ITEM_NUM];
typedef char *PTR_STR;
typedef char BIT8;
typedef int BIT16;

void Convert2Upper(PTR_STR str1, PTR_STR str2);

main()
{
    STRING str;
    STRING moon = {"Whatever we wear","we become beautiful","moon viewing!"};
    BIT16 i;
    BIT16 term = 0;

    for (i=0; i<ITEM_NUM; i++){
        str[i] = malloc((strlen(moon[i])+1) * sizeof(BIT8));
        if (str[i] == NULL){
            printf("malloc() failed.\n");
            term = 1;
            i = ITEM_NUM; /* break the for loop */
        }
        Convert2Upper(moon[i], str[i]);
        printf("%s\n", moon[i]);
    }
    for (i=0; i<ITEM_NUM; i++){
        printf("\n%s", str[i]);
        free (str[i]);
    }

return term;
}
/* function definition */
void Convert2Upper(PTR_STR str1, PTR_STR str2)
{
    BIT16 i;

    for (i=0; str1[i]; i++){
        if ((str1[i] >= 'a') && (str1[i] <= 'z'))
            str2[i] = str1[i] - DELT;
        else
            str2[i] = str1[i];
    }
    str2[i] = '\0'; /* add null character */
}