user: 这段汇编代码用C语言表示是什么样的？

```asm
<vsjson_decode_string>:
  endbr64
  push   %rbp
  mov    %rsp,%rbp
  sub    $0x30,%rsp
  mov    %rdi,-0x28(%rbp)
  cmpq   $0x0,-0x28(%rbp)
  jne    L67
  mov    $0x0,%eax
  jmp    L155
L67:
  mov    -0x28(%rbp),%rax
  mov    %rax,%rdi
  call   <strlen@plt>
  mov    %eax,%edi
  call   <malloc@plt>
  mov    %rax,-0x8(%rbp)
  cmpq   $0x0,-0x8(%rbp)
  jne    L78
  mov    $0x0,%eax
  jmp    L155
L78:
  mov    -0x28(%rbp),%rax
  mov    %rax,%rdi
  call   <strlen@plt>
  mov    %eax,%edx
  mov    -0x8(%rbp),%rax
  mov    $0x0,%esi
  mov    %rax,%rdi
  call   <memset@plt>
  mov    -0x28(%rbp),%rax
  mov    %rax,-0x18(%rbp)
  mov    -0x8(%rbp),%rax
  mov    %rax,-0x10(%rbp)
  mov    -0x28(%rbp),%rax
  movzbl (%rax),%eax
  cmp    $0x22,%al
  jne    L138
  mov    -0x28(%rbp),%rax
  mov    %rax,%rdi
  call   <strlen@plt>
  cltq
  lea    -0x1(%rax),%rdx
  mov    -0x28(%rbp),%rax
  add    %rdx,%rax
  movzbl (%rax),%eax
  cmp    $0x22,%al
  je     L129
L138:
  mov    -0x8(%rbp),%rax
  mov    %rax,%rdi
  call   <free@plt>
  mov    $0x0,%eax
  jmp    L155
L129:
  addq   $0x1,-0x18(%rbp)
  jmp    L64
L52:
  mov    -0x18(%rbp),%rax
  movzbl (%rax),%eax
  movsbl %al,%eax
  cmp    $0x5c,%eax
  jne    L12
  addq   $0x1,-0x18(%rbp)
  mov    -0x18(%rbp),%rax
  movzbl (%rax),%eax
  movsbl %al,%eax
  cmp    $0x74,%eax
  jg     L104
  cmp    $0x5c,%eax
  jge    L156
  cmp    $0x22,%eax
  je     L202
  cmp    $0x2f,%eax
  je     L202
  jmp    L104
L156:
  sub    $0x5c,%eax
  cmp    $0x18,%eax
  ja     L104
  mov    %eax,%eax
  lea    0x0(,%rax,4),%rdx
  lea    D19(%rip),%rax
  mov    (%rdx,%rax,1),%eax
  cltq
  lea    D19(%rip),%rdx
  add    %rdx,%rax
  notrack jmp *%rax
L202:
  mov    -0x18(%rbp),%rax
  movzbl (%rax),%edx
  mov    -0x10(%rbp),%rax
  mov    %dl,(%rax)
  addq   $0x1,-0x10(%rbp)
  mov    -0x10(%rbp),%rax
  movb   $0x8,(%rax)
  addq   $0x1,-0x10(%rbp)
  jmp    L199
  mov    -0x10(%rbp),%rax
  movb   $0xc,(%rax)
  addq   $0x1,-0x10(%rbp)
  jmp    L199
  mov    -0x10(%rbp),%rax
  movb   $0xa,(%rax)
  addq   $0x1,-0x10(%rbp)
  jmp    L199
  mov    -0x10(%rbp),%rax
  movb   $0xd,(%rax)
  addq   $0x1,-0x10(%rbp)
  jmp    L199
  mov    -0x10(%rbp),%rax
  movb   $0x9,(%rax)
  addq   $0x1,-0x10(%rbp)
  nop
L199:
  jmp    L104
L12:
  mov    -0x18(%rbp),%rax
  movzbl (%rax),%edx
  mov    -0x10(%rbp),%rax
  mov    %dl,(%rax)
  addq   $0x1,-0x10(%rbp)
  jmp    L61
L104:
  nop
L61:
  addq   $0x1,-0x18(%rbp)
L64:
  mov    -0x18(%rbp),%rax
  movzbl (%rax),%eax
  test   %al,%al
  jne    L52
  subq   $0x1,-0x10(%rbp)
  mov    -0x10(%rbp),%rax
  movb   $0x0,(%rax)
  mov    -0x8(%rbp),%rax
L155:
  leave
  ret
```

assistant: ```c
char *vsjson_decode_string(const char *string) {
  if (!string)
    return NULL;
  char *decoded = (char *)malloc(strlen(string));
  if (!decoded)
    return NULL;
  memset(decoded, 0, strlen(string));
  const char *src = string;
  char *dst = decoded;
  if (string[0] != '"' || string[strlen(string) - 1] != '"') {
    free(decoded);
    return NULL;
  }
  ++src;
  while (*src) {
    switch (*src) {
    case '\\':
      ++src;
      switch (*src) {
      case '\\':
      case '/':
      case '"':
        *dst = *src;
        ++dst;
      case 'b':
        *dst = '\b';
        ++dst;
        break;
      case 'f':
        *dst = '\f';
        ++dst;
        break;
      case 'n':
        *dst = '\n';
        ++dst;
        break;
      case 'r':
        *dst = '\r';
        ++dst;
        break;
      case 't':
        *dst = '\t';
        ++dst;
        break;
      }
      break;
    default:
      *dst = *src;
      ++dst;
    }
    ++src;
  }
  --dst;
  *dst = 0;
  return decoded;
}
```