user: 这段汇编代码用C语言表示是什么样的：

```asm
<checkISBN>:
  endbr64
  movsbl (%rdi),%eax
  mov    %rdi,%rcx
  test   %al,%al
  je     L396
  movsbl 0x1(%rdi),%edx
  sub    $0x30,%eax
  test   %dl,%dl
  je     L352
  lea    -0x90(%rdx,%rdx,2),%edx
  add    %edx,%eax
  mov    $0x1,%edx
  jmp    L340
  nopl   (%rax)
L396:
  movsbl 0x1(%rdi),%eax
  test   %al,%al
  jne    L260
  movsbl 0x2(%rdi),%esi
  xor    %edx,%edx
  xor    %eax,%eax
  test   %sil,%sil
  je     L461
L364:
  lea    -0x30(%rax,%rsi,1),%eax
  jmp    L409
  nopl   0x0(%rax,%rax,1)
L260:
  sub    $0x30,%eax
  xor    %edx,%edx
L340:
  movsbl 0x2(%rcx),%esi
  add    $0x1,%edx
  test   %sil,%sil
  je     L461
  test   $0x1,%dl
  je     L364
L203:
  lea    -0x90(%rsi,%rsi,2),%esi
  add    %esi,%eax
L409:
  add    $0x1,%edx
L461:
  movsbl 0x3(%rcx),%esi
  test   %sil,%sil
  je     L165
  test   $0x1,%dl
  jne    L146
  lea    -0x30(%rax,%rsi,1),%eax
L35:
  add    $0x1,%edx
L165:
  movsbl 0x4(%rcx),%esi
  test   %sil,%sil
  je     L378
  test   $0x1,%dl
  jne    L97
  lea    -0x30(%rax,%rsi,1),%eax
L228:
  add    $0x1,%edx
L378:
  movsbl 0x5(%rcx),%esi
  test   %sil,%sil
  je     L98
  test   $0x1,%dl
  jne    L157
  lea    -0x30(%rax,%rsi,1),%eax
L313:
  add    $0x1,%edx
L98:
  movsbl 0x6(%rcx),%esi
  test   %sil,%sil
  je     L209
  test   $0x1,%dl
  jne    L362
  lea    -0x30(%rax,%rsi,1),%eax
L422:
  add    $0x1,%edx
L209:
  movsbl 0x7(%rcx),%esi
  test   %sil,%sil
  je     L412
  test   $0x1,%dl
  jne    L248
  lea    -0x30(%rax,%rsi,1),%eax
L242:
  add    $0x1,%edx
L412:
  movsbl 0x8(%rcx),%esi
  test   %sil,%sil
  je     L101
  test   $0x1,%dl
  jne    L77
  lea    -0x30(%rax,%rsi,1),%eax
L206:
  add    $0x1,%edx
L101:
  movsbl 0x9(%rcx),%esi
  test   %sil,%sil
  je     L119
  test   $0x1,%dl
  jne    L270
  lea    -0x30(%rax,%rsi,1),%eax
L230:
  add    $0x1,%edx
L119:
  movsbl 0xa(%rcx),%esi
  test   %sil,%sil
  je     L299
  test   $0x1,%dl
  jne    L345
  lea    -0x30(%rax,%rsi,1),%eax
L14:
  add    $0x1,%edx
L299:
  movsbl 0xb(%rcx),%esi
  test   %sil,%sil
  je     L488
  test   $0x1,%dl
  jne    L71
  lea    -0x30(%rax,%rsi,1),%eax
L176:
  add    $0x1,%edx
L488:
  movsbl 0xc(%rcx),%esi
  test   %sil,%sil
  je     L310
  test   $0x1,%dl
  jne    L371
  lea    -0x30(%rax,%rsi,1),%eax
L445:
  add    $0x1,%edx
L310:
  movsbl 0xd(%rcx),%esi
  test   %sil,%sil
  je     L138
  test   $0x1,%dl
  jne    L465
  lea    -0x30(%rax,%rsi,1),%eax
L459:
  add    $0x1,%edx
L138:
  movsbl 0xe(%rcx),%esi
  test   %sil,%sil
  je     L67
  test   $0x1,%dl
  jne    L420
  lea    -0x30(%rax,%rsi,1),%eax
L12:
  add    $0x1,%edx
L67:
  movsbl 0xf(%rcx),%ecx
  test   %cl,%cl
  je     L363
  and    $0x1,%edx
  jne    L47
  lea    -0x30(%rax,%rcx,1),%eax
L363:
  movslq %eax,%rdx
  mov    %eax,%ecx
  imul   $0x66666667,%rdx,%rdx
  sar    $0x1f,%ecx
  sar    $0x22,%rdx
  sub    %ecx,%edx
  lea    (%rdx,%rdx,4),%edx
  add    %edx,%edx
  sub    %eax,%edx
  lea    0xa(%rdx),%eax
  ret
  nopl   0x0(%rax,%rax,1)
L146:
  lea    -0x90(%rsi,%rsi,2),%esi
  add    %esi,%eax
  jmp    L35
  cs nopw 0x0(%rax,%rax,1)
L97:
  lea    -0x90(%rsi,%rsi,2),%esi
  add    %esi,%eax
  jmp    L228
  xchg   %ax,%ax
L157:
  lea    -0x90(%rsi,%rsi,2),%esi
  add    %esi,%eax
  jmp    L313
  xchg   %ax,%ax
L362:
  lea    -0x90(%rsi,%rsi,2),%esi
  add    %esi,%eax
  jmp    L422
  xchg   %ax,%ax
L248:
  lea    -0x90(%rsi,%rsi,2),%esi
  add    %esi,%eax
  jmp    L242
  xchg   %ax,%ax
L77:
  lea    -0x90(%rsi,%rsi,2),%esi
  add    %esi,%eax
  jmp    L206
  xchg   %ax,%ax
L270:
  lea    -0x90(%rsi,%rsi,2),%esi
  add    %esi,%eax
  jmp    L230
  xchg   %ax,%ax
L345:
  lea    -0x90(%rsi,%rsi,2),%esi
  add    %esi,%eax
  jmp    L14
  xchg   %ax,%ax
L71:
  lea    -0x90(%rsi,%rsi,2),%esi
  add    %esi,%eax
  jmp    L176
  xchg   %ax,%ax
L371:
  lea    -0x90(%rsi,%rsi,2),%esi
  add    %esi,%eax
  jmp    L445
  xchg   %ax,%ax
L465:
  lea    -0x90(%rsi,%rsi,2),%esi
  add    %esi,%eax
  jmp    L459
  xchg   %ax,%ax
L420:
  lea    -0x90(%rsi,%rsi,2),%esi
  add    %esi,%eax
  jmp    L12
  xchg   %ax,%ax
L47:
  lea    -0x90(%rcx,%rcx,2),%edx
  add    %edx,%eax
  jmp    L363
L352:
  movsbl 0x2(%rdi),%esi
  mov    $0x1,%edx
  test   %sil,%sil
  jne    L203
  jmp    L461
```

assistant: ```c
int checkISBN(char *code) {
  int r, sum = 0;
  int i, k = 0;
  for (i = 0; i < 16; i++) {
    if (code[i] != 0) {
      if (k % 2 == 0) {
        sum += (code[i] - 48) * 1;
      } else {
        sum += (code[i] - 48) * 3;
      }
      k++;
    }
  }
  r = sum % 10;
  return 10 - r;
}
```