size_t idx1 = extract_u16(data, offset, size) % VecLen(str);
                    size_t idx2 = extract_u16(data, offset, size) % VecLen(str);
                    StrSwapCharAt(str, idx1, idx2);
                }
                break;

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

    
        // Swap 'H' and 'o'
        StrSwapCharAt(&s, 0, 4);
    
        // Check that the characters were swapped

    
        // Swap 'e' and 'l'
        StrSwapCharAt(&s, 1, 2);
    
        // Check that the characters were swapped