// Test StrForeachInRangeIdx macro
    bool test_str_foreach_in_range_idx(void) {
    WriteFmt("Testing StrForeachInRangeIdx\n");
    
    Str s = StrInitFromZstr("Hello World");

    // Build a new string by iterating through a range of characters with indices
    Str result = StrInit();
    StrForeachInRangeIdx(&s, chr, idx, 6, 11) {
    // Append the character and its index to the result string
    StrWriteFmt(&result, "{c}{}", chr, idx);

    // Test with empty range
    Str empty_result = StrInit();
    StrForeachInRangeIdx(&s, chr, idx, 3, 3) {
    // This block should not execute
    StrPushBack(&empty_result, chr);

    // Make idx go out of bounds in StrForeachInRangeIdx by shrinking string during iteration
    bool test_str_foreach_out_of_bounds_access(void) {
    WriteFmt("Testing StrForeachInRangeIdx where idx goes out of bounds\n");
    
    Str s = StrInitFromZstr("Hello World!"); // 12 characters

    // Even if we shrink the string, the loop will continue until idx reaches the fixed end
    size original_length = s.length; // Capture this as 12
    StrForeachInRangeIdx(&s, chr, idx, 0, original_length) {
    WriteFmt("Accessing idx {} (s.length={}): '{c}'\n", idx, s.length, chr);

    // Make idx go out of bounds in StrForeachInRangeIdx by deleting characters
    bool test_str_foreach_idx_out_of_bounds_access(void) {
    WriteFmt("Testing StrForeachInRangeIdx with character deletion where idx goes out of bounds\n");
    
    Str s = StrInitFromZstr("Programming"); // 11 characters

    // when we delete characters during iteration
    size original_length = s.length; // Capture this as 11
    StrForeachInRangeIdx(&s, chr, idx, 0, original_length) {
    WriteFmt("Accessing idx {} (s.length={}): '{c}'\n", idx, s.length, chr);

    if (start < end) {
    size_t total_len = 0;
    StrForeachInRangeIdx(str, ch, idx, start, end) {
    total_len += 1 + idx;
    }