user: Please show me the C implementation that matches the assembly code listed below:

```asm
<main>:
  endbr64
  sub    $0x8,%rsp
  xor    %eax,%eax
  call   <init_palette@plt>
  sub    $0x8,%rsp
  xor    %r8d,%r8d
  xor    %ecx,%ecx
  push   $0xab
  mov    $0x13f,%r9d
  mov    $0xe,%edx
  mov    $0x140,%esi
  mov    $0xa0000,%edi
  call   <boxfill8@plt>
  mov    $0x13f,%r9d
  mov    $0xac,%r8d
  xor    %ecx,%ecx
  mov    $0x8,%edx
  mov    $0x140,%esi
  mov    $0xa0000,%edi
  movl   $0xac,(%rsp)
  call   <boxfill8@plt>
  mov    $0x13f,%r9d
  mov    $0xad,%r8d
  xor    %ecx,%ecx
  mov    $0x7,%edx
  mov    $0x140,%esi
  mov    $0xa0000,%edi
  movl   $0xad,(%rsp)
  call   <boxfill8@plt>
  mov    $0x13f,%r9d
  mov    $0xae,%r8d
  xor    %ecx,%ecx
  mov    $0x8,%edx
  mov    $0x140,%esi
  mov    $0xa0000,%edi
  movl   $0xc7,(%rsp)
  call   <boxfill8@plt>
  mov    $0x3b,%r9d
  mov    $0xb0,%r8d
  mov    $0x3,%ecx
  mov    $0x7,%edx
  mov    $0x140,%esi
  mov    $0xa0000,%edi
  movl   $0xb0,(%rsp)
  call   <boxfill8@plt>
  mov    $0x2,%r9d
  mov    $0xb0,%r8d
  mov    $0x2,%ecx
  mov    $0x7,%edx
  mov    $0x140,%esi
  mov    $0xa0000,%edi
  movl   $0xc4,(%rsp)
  call   <boxfill8@plt>
  mov    $0x3b,%r9d
  mov    $0xc4,%r8d
  mov    $0x3,%ecx
  mov    $0xf,%edx
  mov    $0x140,%esi
  mov    $0xa0000,%edi
  movl   $0xc4,(%rsp)
  call   <boxfill8@plt>
  mov    $0x3b,%r9d
  mov    $0xb1,%r8d
  mov    $0x3b,%ecx
  mov    $0xf,%edx
  mov    $0x140,%esi
  mov    $0xa0000,%edi
  movl   $0xc3,(%rsp)
  call   <boxfill8@plt>
  mov    $0x3b,%r9d
  mov    $0xc5,%r8d
  xor    %edx,%edx
  mov    $0x2,%ecx
  mov    $0x140,%esi
  mov    $0xa0000,%edi
  movl   $0xc5,(%rsp)
  call   <boxfill8@plt>
  mov    $0x3c,%r9d
  mov    $0xb0,%r8d
  xor    %edx,%edx
  mov    $0x3c,%ecx
  mov    $0x140,%esi
  mov    $0xa0000,%edi
  movl   $0xc5,(%rsp)
  call   <boxfill8@plt>
  mov    $0x13c,%r9d
  mov    $0xb0,%r8d
  mov    $0x111,%ecx
  mov    $0xf,%edx
  mov    $0x140,%esi
  mov    $0xa0000,%edi
  movl   $0xb0,(%rsp)
  call   <boxfill8@plt>
  mov    $0x111,%r9d
  mov    $0xb1,%r8d
  mov    $0x111,%ecx
  mov    $0xf,%edx
  mov    $0x140,%esi
  mov    $0xa0000,%edi
  movl   $0xc4,(%rsp)
  call   <boxfill8@plt>
  mov    $0x13c,%r9d
  mov    $0xc5,%r8d
  mov    $0x111,%ecx
  mov    $0x7,%edx
  mov    $0x140,%esi
  mov    $0xa0000,%edi
  movl   $0xc5,(%rsp)
  call   <boxfill8@plt>
  mov    $0x7,%edx
  mov    $0x13d,%r9d
  mov    $0xb0,%r8d
  mov    $0x13d,%ecx
  mov    $0x140,%esi
  mov    $0xa0000,%edi
  movl   $0xc5,(%rsp)
  call   <boxfill8@plt>
  pop    %rax
  pop    %rdx
  cs nopw 0x0(%rax,%rax,1)
L5:
  xor    %eax,%eax
  call   <_io_hlt@plt>
  jmp    L5
```

assistant: ```c
void main() {
  init_palette();
  char *vram;
  int xsize, ysize;
  vram = (char *)0xa0000;
  xsize = 320;
  ysize = 200;
  boxfill8(vram, xsize, 14, 0, 0, xsize - 1, ysize - 29);
  boxfill8(vram, xsize, 8, 0, ysize - 28, xsize - 1, ysize - 28);
  boxfill8(vram, xsize, 7, 0, ysize - 27, xsize - 1, ysize - 27);
  boxfill8(vram, xsize, 8, 0, ysize - 26, xsize - 1, ysize - 1);
  boxfill8(vram, xsize, 7, 3, ysize - 24, 59, ysize - 24);
  boxfill8(vram, xsize, 7, 2, ysize - 24, 2, ysize - 4);
  boxfill8(vram, xsize, 15, 3, ysize - 4, 59, ysize - 4);
  boxfill8(vram, xsize, 15, 59, ysize - 23, 59, ysize - 5);
  boxfill8(vram, xsize, 0, 2, ysize - 3, 59, ysize - 3);
  boxfill8(vram, xsize, 0, 60, ysize - 24, 60, ysize - 3);
  boxfill8(vram, xsize, 15, xsize - 47, ysize - 24, xsize - 4, ysize - 24);
  boxfill8(vram, xsize, 15, xsize - 47, ysize - 23, xsize - 47, ysize - 4);
  boxfill8(vram, xsize, 7, xsize - 47, ysize - 3, xsize - 4, ysize - 3);
  boxfill8(vram, xsize, 7, xsize - 3, ysize - 24, xsize - 3, ysize - 3);
  for (;;) {
    _io_hlt();
  }
}
```