user: 提供的汇编代码用C语言表示会是什么样子：

```asm
<writeDigit>:
  endbr64
  push   %rbp
  pxor   %xmm0,%xmm0
  push   %rbx
  sub    $0x48,%rsp
  mov    %fs:0x28,%rax
  mov    %rax,0x38(%rsp)
  xor    %eax,%eax
  movb   $0x0,0x30(%rsp)
  movaps %xmm0,0x20(%rsp)
  test   %rdi,%rdi
  je     L461
  movabs $0xcccccccccccccccd,%rsi
  mov    %rdi,%rax
  mov    %rdi,%rcx
  mul    %rsi
  mov    %rcx,%rax
  mov    %rdx,%rdi
  shr    $0x3,%rdi
  lea    (%rdi,%rdi,4),%rdx
  add    %rdx,%rdx
  sub    %rdx,%rax
  add    $0x30,%eax
  mov    %al,(%rsp)
  cmp    $0x9,%rcx
  jbe    L162
  mov    %rdi,%rax
  mul    %rsi
  mov    %rdi,%rax
  shr    $0x3,%rdx
  mov    %rdx,%r8
  lea    (%rdx,%rdx,4),%rdx
  add    %rdx,%rdx
  sub    %rdx,%rax
  add    $0x30,%eax
  mov    %al,0x1(%rsp)
  cmp    $0x63,%rcx
  jbe    L119
  mov    %r8,%rax
  mul    %rsi
  mov    %r8,%rax
  shr    $0x3,%rdx
  mov    %rdx,%r9
  lea    (%rdx,%rdx,4),%rdx
  add    %rdx,%rdx
  sub    %rdx,%rax
  add    $0x30,%eax
  mov    %al,0x2(%rsp)
  cmp    $0x3e7,%rcx
  jbe    L108
  mov    %r9,%rax
  mul    %rsi
  mov    %r9,%rax
  shr    $0x3,%rdx
  mov    %rdx,%r10
  lea    (%rdx,%rdx,4),%rdx
  add    %rdx,%rdx
  sub    %rdx,%rax
  add    $0x30,%eax
  mov    %al,0x3(%rsp)
  cmp    $0x270f,%rcx
  jbe    L161
  mov    %r10,%rax
  mul    %rsi
  mov    %r10,%rax
  shr    $0x3,%rdx
  mov    %rdx,%r11
  lea    (%rdx,%rdx,4),%rdx
  add    %rdx,%rdx
  sub    %rdx,%rax
  add    $0x30,%eax
  mov    %al,0x4(%rsp)
  cmp    $0x1869f,%rcx
  jbe    L364
  mov    %r11,%rax
  mul    %rsi
  mov    %r11,%rax
  mov    %rdx,%rbx
  shr    $0x3,%rbx
  lea    (%rbx,%rbx,4),%rdx
  add    %rdx,%rdx
  sub    %rdx,%rax
  add    $0x30,%eax
  mov    %al,0x5(%rsp)
  cmp    $0xf423f,%rcx
  jbe    L504
  mov    %rbx,%rax
  mul    %rsi
  mov    %rbx,%rax
  shr    $0x3,%rdx
  mov    %rdx,%r11
  lea    (%rdx,%rdx,4),%rdx
  add    %rdx,%rdx
  sub    %rdx,%rax
  add    $0x30,%eax
  mov    %al,0x6(%rsp)
  cmp    $0x98967f,%rcx
  jbe    L197
  mov    %r11,%rax
  mul    %rsi
  mov    %r11,%rax
  mov    %rdx,%rbx
  shr    $0x3,%rbx
  lea    (%rbx,%rbx,4),%rdx
  add    %rdx,%rdx
  sub    %rdx,%rax
  add    $0x30,%eax
  mov    %al,0x7(%rsp)
  cmp    $0x5f5e0ff,%rcx
  jbe    L414
  mov    %rbx,%rax
  mul    %rsi
  mov    %rbx,%rax
  mov    %rdx,%rsi
  shr    $0x3,%rsi
  lea    (%rsi,%rsi,4),%rdx
  add    %rdx,%rdx
  sub    %rdx,%rax
  add    $0x30,%eax
  mov    %al,0x8(%rsp)
  cmp    $0x3b9ac9ff,%rcx
  jbe    L436
  movabs $0xcccccccccccccccd,%rbx
  mov    %rsi,%rax
  mul    %rbx
  shr    $0x3,%rdx
  lea    (%rdx,%rdx,4),%rax
  mov    %rdx,%r11
  add    %rax,%rax
  sub    %rax,%rsi
  movabs $0x2540be3ff,%rax
  add    $0x30,%esi
  mov    %sil,0x9(%rsp)
  cmp    %rax,%rcx
  jbe    L497
  mov    %rdx,%rax
  mul    %rbx
  mov    %rdx,%rsi
  shr    $0x3,%rsi
  lea    (%rsi,%rsi,4),%rax
  add    %rax,%rax
  sub    %rax,%r11
  lea    0x30(%r11),%eax
  mov    %al,0xa(%rsp)
  movabs $0x174876e7ff,%rax
  cmp    %rax,%rcx
  jbe    L5
  movabs $0xe8d4a50fff,%rbp
  mov    %rsi,%rax
  mul    %rbx
  shr    $0x3,%rdx
  lea    (%rdx,%rdx,4),%rax
  mov    %rdx,%r11
  add    %rax,%rax
  sub    %rax,%rsi
  lea    0x30(%rsi),%eax
  mov    %al,0xb(%rsp)
  cmp    %rbp,%rcx
  jbe    L441
  mov    %rdx,%rax
  mul    %rbx
  mov    %rdx,%rcx
  shr    $0x3,%rcx
  lea    (%rcx,%rcx,4),%rax
  add    %rax,%rax
  sub    %rax,%r11
  lea    0x30(%r11),%eax
  mov    %al,0xc(%rsp)
  cmp    %rbp,%rdi
  jbe    L476
  mov    %rcx,%rax
  mul    %rbx
  mov    %rdx,%rsi
  shr    $0x3,%rsi
  lea    (%rsi,%rsi,4),%rax
  add    %rax,%rax
  sub    %rax,%rcx
  lea    0x30(%rcx),%eax
  mov    %al,0xd(%rsp)
  cmp    %rbp,%r8
  jbe    L123
  mov    %rsi,%rax
  mul    %rbx
  mov    %rdx,%rcx
  shr    $0x3,%rcx
  lea    (%rcx,%rcx,4),%rax
  add    %rax,%rax
  sub    %rax,%rsi
  lea    0x30(%rsi),%eax
  mov    %al,0xe(%rsp)
  cmp    %rbp,%r9
  jbe    L176
  mov    %rcx,%rax
  mul    %rbx
  mov    %rdx,%rsi
  shr    $0x3,%rsi
  lea    (%rsi,%rsi,4),%rax
  add    %rax,%rax
  sub    %rax,%rcx
  lea    0x30(%rcx),%eax
  mov    %al,0xf(%rsp)
  cmp    %rbp,%r10
  jbe    L142
  mov    %rsi,%rax
  mul    %rbx
  shr    $0x3,%rdx
  lea    (%rdx,%rdx,4),%rax
  add    %rax,%rax
  sub    %rax,%rsi
  lea    0x30(%rsi),%eax
  mov    %al,0x10(%rsp)
  mov    $0x10,%eax
  nopl   0x0(%rax)
L456:
  mov    %eax,%ecx
  movzbl (%rsp,%rcx,1),%edx
  mov    %dl,0x20(%rsp)
  lea    -0x1(%rax),%edx
  movzbl (%rsp,%rdx,1),%edx
  mov    %dl,0x21(%rsp)
  lea    -0x2(%rax),%edx
  movzbl (%rsp,%rdx,1),%edx
  mov    %dl,0x22(%rsp)
  mov    %eax,%edx
  sub    $0x3,%edx
  je     L380
  mov    %edx,%edx
  movzbl (%rsp,%rdx,1),%edx
  mov    %dl,0x23(%rsp)
  mov    %eax,%edx
  sub    $0x4,%edx
  je     L63
  mov    %edx,%edx
  movzbl (%rsp,%rdx,1),%edx
  mov    %dl,0x24(%rsp)
  mov    %eax,%edx
  sub    $0x5,%edx
  je     L447
  mov    %edx,%edx
  movzbl (%rsp,%rdx,1),%edx
  mov    %dl,0x25(%rsp)
  mov    %eax,%edx
  sub    $0x6,%edx
  je     L447
  mov    %edx,%edx
  movzbl (%rsp,%rdx,1),%edx
  mov    %dl,0x26(%rsp)
  mov    %eax,%edx
  sub    $0x7,%edx
  je     L447
  mov    %edx,%edx
  movzbl (%rsp,%rdx,1),%edx
  mov    %dl,0x27(%rsp)
  mov    %eax,%edx
  sub    $0x8,%edx
  je     L447
  mov    %edx,%edx
  movzbl (%rsp,%rdx,1),%edx
  mov    %dl,0x28(%rsp)
  mov    %eax,%edx
  sub    $0x9,%edx
  je     L447
  mov    %edx,%edx
  movzbl (%rsp,%rdx,1),%edx
  mov    %dl,0x29(%rsp)
  mov    %eax,%edx
  sub    $0xa,%edx
  je     L447
  mov    %edx,%edx
  movzbl (%rsp,%rdx,1),%edx
  mov    %dl,0x2a(%rsp)
  mov    %eax,%edx
  sub    $0xb,%edx
  je     L447
  mov    %edx,%edx
  movzbl (%rsp,%rdx,1),%edx
  mov    %dl,0x2b(%rsp)
  mov    %eax,%edx
  sub    $0xc,%edx
  je     L447
  mov    %edx,%edx
  movzbl (%rsp,%rdx,1),%edx
  mov    %dl,0x2c(%rsp)
  mov    %eax,%edx
  sub    $0xd,%edx
  je     L447
  mov    %edx,%edx
  movzbl (%rsp,%rdx,1),%edx
  mov    %dl,0x2d(%rsp)
  mov    %eax,%edx
  sub    $0xe,%edx
  je     L447
  mov    %edx,%edx
  movzbl (%rsp,%rdx,1),%edx
  mov    %dl,0x2e(%rsp)
  mov    %eax,%edx
  sub    $0xf,%edx
  je     L447
  mov    %edx,%edx
  movzbl (%rsp,%rdx,1),%edx
  mov    %dl,0x2f(%rsp)
  sub    $0x10,%eax
  je     L447
  mov    %eax,%eax
  movzbl (%rsp,%rax,1),%eax
  mov    %al,0x30(%rsp)
L447:
  movzbl (%rsp),%eax
  lea    0x20(%rsp),%rdi
  mov    %al,0x20(%rsp,%rcx,1)
  call   <writeString@plt>
  mov    0x38(%rsp),%rax
  sub    %fs:0x28,%rax
  jne    L140
  add    $0x48,%rsp
  pop    %rbx
  pop    %rbp
  ret
L364:
  mov    $0x4,%eax
  jmp    L456
L461:
  mov    $0xffffffff,%eax
  jmp    L456
L162:
  xor    %ecx,%ecx
  jmp    L447
L119:
  mov    %al,0x20(%rsp)
  mov    $0x1,%ecx
  jmp    L447
L108:
  movzwl 0x1(%rsp),%eax
  mov    $0x2,%ecx
  rol    $0x8,%ax
  mov    %ax,0x20(%rsp)
  jmp    L447
L380:
  mov    $0x3,%ecx
  jmp    L447
L63:
  mov    $0x4,%ecx
  jmp    L447
L161:
  mov    $0x3,%eax
  jmp    L456
L504:
  mov    $0x5,%eax
  jmp    L456
L476:
  mov    $0xc,%eax
  jmp    L456
L197:
  mov    $0x6,%eax
  jmp    L456
L414:
  mov    $0x7,%eax
  jmp    L456
L436:
  mov    $0x8,%eax
  jmp    L456
L497:
  mov    $0x9,%eax
  jmp    L456
L5:
  mov    $0xa,%eax
  jmp    L456
L441:
  mov    $0xb,%eax
  jmp    L456
L123:
  mov    $0xd,%eax
  jmp    L456
L176:
  mov    $0xe,%eax
  jmp    L456
L142:
  mov    $0xf,%eax
  jmp    L456
L140:
  call   <__stack_chk_fail@plt>
```

assistant: ```c
void writeDigit(unsigned long long n) {
  unsigned int i;
  unsigned int top;
  char tmp[17];
  char str[17];
  for (i = 0; i < 17; ++i)
    str[i] = 0;
  i = 0;
  while (n > 0) {
    tmp[i] = '0' + (n % 10);
    n /= 10;
    i = i + 1;
  }
  i--;
  top = i;
  while (i > 0) {
    str[top - i] = tmp[i];
    i--;
  }
  str[top] = tmp[0];
  writeString(str);
}
```