user: 提供的汇编代码用C语言表示会是什么样子:

```asm
<hexadecimal_to_decimal>:
  endbr64
  push   %r13
  push   %r12
  push   %rbp
  push   %rbx
  mov    %rdi,%rbx
  sub    $0x8,%rsp
  call   <strlen@plt>
  mov    %eax,%r13d
  sub    $0x1,%eax
  js     L117
  cltq
  xor    %ebp,%ebp
  xor    %r12d,%r12d
  add    %rax,%rbx
  jmp    L126
  nopl   0x0(%rax)
L329:
  cmp    $0x31,%al
  je     L98
L160:
  cmp    $0x32,%al
  je     L46
L141:
  cmp    $0x33,%al
  je     L288
L335:
  cmp    $0x34,%al
  je     L70
L259:
  cmp    $0x35,%al
  je     L4
L342:
  cmp    $0x36,%al
  je     L29
L99:
  cmp    $0x37,%al
  je     L317
L128:
  cmp    $0x38,%al
  je     L248
L268:
  cmp    $0x39,%al
  je     L300
L213:
  cmp    $0x61,%al
  je     L201
L328:
  cmp    $0x62,%al
  je     L193
L152:
  cmp    $0x63,%al
  je     L305
L5:
  cmp    $0x64,%al
  je     L47
L39:
  cmp    $0x65,%al
  je     L16
L345:
  cmp    $0x66,%al
  je     L261
L197:
  add    $0x1,%ebp
  sub    $0x1,%rbx
  cmp    %ebp,%r13d
  je     L348
L126:
  movzbl (%rbx),%eax
  cmp    $0x30,%al
  jne    L329
  mov    %ebp,%esi
  mov    $0x10,%edi
  call   <pow@plt>
  movzbl (%rbx),%eax
  cmp    $0x31,%al
  jne    L160
L98:
  mov    %ebp,%esi
  mov    $0x10,%edi
  call   <pow@plt>
  add    %eax,%r12d
  movzbl (%rbx),%eax
  cmp    $0x32,%al
  jne    L141
L46:
  mov    %ebp,%esi
  mov    $0x10,%edi
  call   <pow@plt>
  lea    (%r12,%rax,2),%r12d
  movzbl (%rbx),%eax
  cmp    $0x33,%al
  jne    L335
L288:
  mov    %ebp,%esi
  mov    $0x10,%edi
  call   <pow@plt>
  lea    (%rax,%rax,2),%eax
  add    %eax,%r12d
  movzbl (%rbx),%eax
  cmp    $0x34,%al
  jne    L259
L70:
  mov    %ebp,%esi
  mov    $0x10,%edi
  call   <pow@plt>
  lea    (%r12,%rax,4),%r12d
  movzbl (%rbx),%eax
  cmp    $0x35,%al
  jne    L342
L4:
  mov    %ebp,%esi
  mov    $0x10,%edi
  call   <pow@plt>
  lea    (%rax,%rax,4),%eax
  add    %eax,%r12d
  movzbl (%rbx),%eax
  cmp    $0x36,%al
  jne    L99
L29:
  mov    %ebp,%esi
  mov    $0x10,%edi
  call   <pow@plt>
  lea    (%rax,%rax,2),%eax
  lea    (%r12,%rax,2),%r12d
  movzbl (%rbx),%eax
  cmp    $0x37,%al
  jne    L128
L317:
  mov    %ebp,%esi
  mov    $0x10,%edi
  call   <pow@plt>
  lea    (%r12,%rax,8),%r12d
  sub    %eax,%r12d
  movzbl (%rbx),%eax
  cmp    $0x38,%al
  jne    L268
L248:
  mov    %ebp,%esi
  mov    $0x10,%edi
  call   <pow@plt>
  lea    (%r12,%rax,8),%r12d
  movzbl (%rbx),%eax
  cmp    $0x39,%al
  jne    L213
L300:
  mov    %ebp,%esi
  mov    $0x10,%edi
  call   <pow@plt>
  lea    (%rax,%rax,8),%eax
  add    %eax,%r12d
  movzbl (%rbx),%eax
  cmp    $0x61,%al
  jne    L328
L201:
  mov    %ebp,%esi
  mov    $0x10,%edi
  call   <pow@plt>
  lea    (%rax,%rax,4),%eax
  lea    (%r12,%rax,2),%r12d
  movzbl (%rbx),%eax
  cmp    $0x62,%al
  jne    L152
L193:
  mov    %ebp,%esi
  mov    $0x10,%edi
  call   <pow@plt>
  lea    (%rax,%rax,4),%edx
  lea    (%rax,%rdx,2),%eax
  add    %eax,%r12d
  movzbl (%rbx),%eax
  cmp    $0x63,%al
  jne    L5
L305:
  mov    %ebp,%esi
  mov    $0x10,%edi
  call   <pow@plt>
  lea    (%rax,%rax,2),%eax
  lea    (%r12,%rax,4),%r12d
  movzbl (%rbx),%eax
  cmp    $0x64,%al
  jne    L39
L47:
  mov    %ebp,%esi
  mov    $0x10,%edi
  call   <pow@plt>
  lea    (%rax,%rax,2),%edx
  lea    (%rax,%rdx,4),%eax
  add    %eax,%r12d
  movzbl (%rbx),%eax
  cmp    $0x65,%al
  jne    L345
L16:
  mov    %ebp,%esi
  mov    $0x10,%edi
  call   <pow@plt>
  imul   $0xe,%eax,%eax
  add    %eax,%r12d
  movzbl (%rbx),%eax
  cmp    $0x66,%al
  jne    L197
L261:
  mov    %ebp,%esi
  mov    $0x10,%edi
  add    $0x1,%ebp
  sub    $0x1,%rbx
  call   <pow@plt>
  mov    %eax,%r8d
  shl    $0x4,%eax
  sub    %r8d,%eax
  add    %eax,%r12d
  cmp    %ebp,%r13d
  jne    L126
L348:
  add    $0x8,%rsp
  mov    %r12d,%eax
  pop    %rbx
  pop    %rbp
  pop    %r12
  pop    %r13
  ret
L117:
  add    $0x8,%rsp
  xor    %r12d,%r12d
  pop    %rbx
  mov    %r12d,%eax
  pop    %rbp
  pop    %r12
  pop    %r13
  ret
```

assistant: ```c
int hexadecimal_to_decimal(char *hexadecimal) {
  int decimalNumber = 0;
  char hexDigits[16] = {'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f'};
  int i, j, power = 0, digit;
  for (i = strlen(hexadecimal) - 1; i >= 0; i--) {
    for (j = 0; j < 16; j++) {
      if (hexadecimal[i] == hexDigits[j]) {
        decimalNumber += j * pow(16, power);
      }
    }
    power++;
  }
  return decimalNumber;
}
```