case STR_BEGIN : {
                char *begin = StrBegin(str);
                (void)begin; // Suppress unused variable warning
                break;

    // Test StrBegin function
    bool test_str_begin(void) {
        WriteFmt("Testing StrBegin\n");
    
        Str s = StrInitFromZstr("Hello");

    
        // Get a pointer to the first character using StrBegin
        char *begin = StrBegin(&s);
    
        // Check that the pointer is correct