// Test VecFirst and VecLast functions
    bool test_vec_first_last(void) {
    WriteFmt("Testing VecFirst and VecLast\n");
    
    // Create a vector of integers

    // Check first and last elements
    bool result = (VecFirst(&vec) == 10);
    result      = result && (VecLast(&vec) == 30);
    
    // Modify first and last elements

    // Modify first and last elements
    VecFirst(&vec) = 15;
    VecLast(&vec)  = 35;
    
    // Verify changes

    /// Access last character in string
    ///
    #define StrLast(str) VecLast(str)
    
    ///

    case VEC_INT_LAST : {
    if (VecLen(vec) > 0) {
    volatile i32 last = VecLast(vec);
    (void)last;
    }

    case VEC_STR_LAST : {
    if (VecLen(vec) > 0) {
    Str last = VecLast(vec);
    (void)last; // Use the result to avoid warnings
    }

    case VEC_CHAR_PTR_LAST : {
    if (VecLen(vec) > 0) {
    char *last = VecLast(vec);
    (void)last; // Use the result to avoid warnings
    }