I start with : https:$//$www$.$chegg.com$/$homework$-$help$/$questions$-$and$-$answers$/$write$-$memory$-$system$-$cpp$-1-$write$-$programs$-$cross$-$platform$-$c$-2-$containers$-$stl$-$allowed$-$vector$--$q$175770100?$share$=24$e$92$c$6$d$-$bb$16-4$ee$4-978$a$-4$aa$5673$b$32$f$5$

and My code is here :

#include "Mem.h$"$

#include "Heap.h$"$

#include "Type.h$"$

struct SecretPtr $\{$ Free $*$pFree; $\}$;

void Mem::initialize$()\{$

this$->$poHeap$->$pUsedHead $=$ nullptr;

this$->$poHeap$->$pFreeHead $=$ nullptr;

uintptr$\_$t freeBlockAddr $=$ reinterpret$\_$cast$($this$->$poRawMem$)+$ sizeof$($Heap$)$;

this$->$poHeap$->$pNextFit $=$ reinterpret$\_$cast$($freeBlockAddr$)$;

uint$32\_$t availableMem $=$ Mem::TotalSize $-$ sizeof$($Heap$)-$ sizeof$($Free$)$;

Free$*$ freeBlock $=$ this$->$poHeap$->$pNextFit;

freeBlock$->$pNext $=$ nullptr;

freeBlock$->$pPrev $=$ nullptr;

SET$\_$FREE$($freeBlock$->$mData$)$;

SET$\_$ABOVE$\_$USED$($freeBlock$->$mData$)$;

SET$\_$ALLOC$\_$SIZE$($freeBlock$->$mData, availableMem$)$;

this$->$poHeap$->$pFreeHead $=$ freeBlock;

this$->$poHeap$->$currNumUsedBlocks $=0$;

this$->$poHeap$->$currUsedMem $=0$;

this$->$poHeap$->$currNumFreeBlocks $=1$;

this$->$poHeap$->$currFreeMem $=$ availableMem;

$\}$

void$*$ Mem::malloc$($const uint$32\_$t $\_$size$)\{$

$//$ check Image

$\}$

void Mem::free$($void$*$ const data$)$

$\{$

if $($data $==$ nullptr$)\{$

return;

$\}$

Used$*$ usedBlock $=$ reinterpret$\_$cast$($data$)-1$;

Free$*$ freeBlock $=$ reinterpret$\_$cast$($usedBlock$)$;

SET$\_$FREE$($freeBlock$->$mData$)$;

SET$\_$ABOVE$\_$USED$($freeBlock$->$mData$)$;

SET$\_$ALLOC$\_$SIZE$($freeBlock$->$mData, usedBlock$->$mData$)$;

Free$*$ prevFreeBlock $=$ nullptr;

Free$*$ nextFreeBlock $=$ nullptr;

uintptr$\_$t nextBlockAddr $=$ reinterpret$\_$cast$($freeBlock$)+$ GET$\_$ALLOC$\_$SIZE$($freeBlock$->$mData$)$;

uintptr$\_$t h $=$ reinterpret$\_$cast$($this$->$poRawMem$)+$ Mem::TotalSize;

if $($nextBlockAddr $$ h$)\{$

Used$*$ nextBlockHeader $=$ reinterpret$\_$cast$($nextBlockAddr$)$;

if $(!$IS$\_$USED$($nextBlockHeader$->$mData$))\{$

nextFreeBlock $=$ reinterpret$\_$cast$($nextBlockHeader$)$;

this$->$poHeap$->$pNextFit $=$ nextFreeBlock;

$\}$

$\}$

uintptr$\_$t prevBlockAddr $=$ reinterpret$\_$cast$($freeBlock$)-$ GET$\_$ALLOC$\_$SIZE$($reinterpret$\_$cast$($freeBlock $-1)->$mData$)$;

if $($prevBlockAddr $>=$ reinterpret$\_$cast$($this$->$poRawMem$)+$ sizeof$($Heap$))\{$

Free$*$ prevBlockHeader $=$ reinterpret$\_$cast$($prevBlockAddr$)$;

if $(!$IS$\_$USED$($prevBlockHeader$->$mData$))\{$

prevFreeBlock $=$ prevBlockHeader;

$\}$

$\}$

if $($this$->$poHeap$->$pUsedHead $==$ usedBlock$)\{$

this$->$poHeap$->$pUsedHead $=$ usedBlock$->$pNext;

$\}$

else $\{$

usedBlock$->$pPrev$->$pNext $=$ usedBlock$->$pNext;

if $($usedBlock$->$pNext $!=$ nullptr$)\{$

usedBlock$->$pNext$->$pPrev $=$ usedBlock$->$pPrev;

$\}$

$\}$

this$->$poHeap$->$currNumUsedBlocks$--$;

this$->$poHeap$->$currUsedMem $-=$ GET$\_$ALLOC$\_$SIZE$($freeBlock$->$mData$)$;

this$->$poHeap$->$currNumFreeBlocks$++$;

this$->$poHeap$->$currFreeMem $+=$ GET$\_$ALLOC$\_$SIZE$($freeBlock$->$mData$)$;

if $($prevFreeBlock $!=$ nullptr$)\{$

prevFreeBlock$->$pNext $=$ freeBlock$->$pNext;

if $($freeBlock$->$pNext $!=$ nullptr$)\{$

freeBlock$->$pNext$->$pPrev $=$ prevFreeBlock;

$\}$

freeBlock $=$ prevFreeBlock;

$\}$

if $($nextFreeBlock $!=$ nullptr$)\{$

if $($freeBlock$->$pNext $!=$ nullptr$)\{$

freeBlock$->$pNext$->$pPrev $=$ freeBlock;

$\}$

freeBlock$->$pNext $=$ nextFreeBlock$->$pNext;

SET$\_$ALLOC$\_$SIZE$($freeBlock$->$mData, GET$\_$ALLOC$\_$SIZE$($freeBlock$->$mData$)+$ GET$\_$ALLOC$\_$SIZE$($nextFreeBlock$->$mData$))$;

if $($this$->$poHeap$->$pNextFit $==$ nextFreeBlock$)\{$

this$->$poHeap$->$pNextFit $=$ freeBlock;

$\}$

$\}$

freeBlock$->$pNext $=$ this$->$poHeap$->$pFreeHead;

if $($this$->$poHeap$->$pFreeHead $!=$ nullptr$)\{$

this$->$poHeap$->$pFreeHead$->$pPrev $=$ freeBlock;

$\}$

this$->$poHeap$->$pFreeHead $=$ freeBlock;

freeBlock$->$pPrev $=$ nullptr;

$\}$

$//---$ End of File $---$

No code has been changed except Mem.cpp$.$

But I cannot pass test code with

blkStart $=$ hdrEnd;

blkEnd $=$ blkStart $+$ GET$\_$ALLOC$\_$SIZE$($free$->$mData$)$;

CHECK$\_$EQUAL$($PTR$\_$FIX$($blkStart$),$ PTR$\_$FIX$($hdrEnd$))$;

CHECK$\_$EQUAL$($PTR$\_$FIX$($blkEnd$),0$xc$800)$;

CHECK$\_$EQUAL$($ GET$\_$ALLOC$\_$SIZE$($used$->$mData$),0$xc$7$d$4)$;

Please fix my code and pass this tests code line.