user: 提供的汇编代码用C语言表示会是什么样子：

```asm
<fmt_iso8601>:
  endbr64
  push   %rbp
  mov    %rsp,%rbp
  sub    $0x20,%rsp
  mov    %rdi,-0x18(%rbp)
  mov    %esi,-0x1c(%rbp)
  lea    -0x1c(%rbp),%rax
  mov    %rax,%rdi
  call   <gmtime@plt>
  mov    %rax,-0x10(%rbp)
  cmpq   $0x0,-0x18(%rbp)
  jne    L16
  mov    $0x14,%eax
  jmp    L7
L16:
  mov    -0x10(%rbp),%rax
  mov    (%rax),%eax
  add    $0x76c,%eax
  movslq %eax,%rdx
  imul   $0x51eb851f,%rdx,%rdx
  shr    $0x20,%rdx
  sar    $0x5,%edx
  sar    $0x1f,%eax
  sub    %eax,%edx
  mov    -0x18(%rbp),%rax
  mov    %edx,%esi
  mov    %rax,%rdi
  call   <fmt_2digits@plt>
  mov    %rax,-0x8(%rbp)
  mov    -0x10(%rbp),%rax
  mov    (%rax),%eax
  lea    0x76c(%rax),%edx
  movslq %edx,%rax
  imul   $0x51eb851f,%rax,%rax
  shr    $0x20,%rax
  sar    $0x5,%eax
  mov    %edx,%ecx
  sar    $0x1f,%ecx
  sub    %ecx,%eax
  imul   $0x64,%eax,%ecx
  mov    %edx,%eax
  sub    %ecx,%eax
  mov    -0x18(%rbp),%rcx
  mov    -0x8(%rbp),%rdx
  add    %rcx,%rdx
  mov    %eax,%esi
  mov    %rdx,%rdi
  call   <fmt_2digits@plt>
  add    %rax,-0x8(%rbp)
  mov    -0x8(%rbp),%rax
  lea    0x1(%rax),%rdx
  mov    %rdx,-0x8(%rbp)
  mov    -0x18(%rbp),%rdx
  add    %rdx,%rax
  movb   $0x2d,(%rax)
  mov    -0x10(%rbp),%rax
  mov    0x4(%rax),%eax
  lea    0x1(%rax),%edx
  mov    -0x18(%rbp),%rcx
  mov    -0x8(%rbp),%rax
  add    %rcx,%rax
  mov    %edx,%esi
  mov    %rax,%rdi
  call   <fmt_2digits@plt>
  add    %rax,-0x8(%rbp)
  mov    -0x8(%rbp),%rax
  lea    0x1(%rax),%rdx
  mov    %rdx,-0x8(%rbp)
  mov    -0x18(%rbp),%rdx
  add    %rdx,%rax
  movb   $0x2d,(%rax)
  mov    -0x10(%rbp),%rax
  mov    0x8(%rax),%eax
  mov    -0x18(%rbp),%rcx
  mov    -0x8(%rbp),%rdx
  add    %rcx,%rdx
  mov    %eax,%esi
  mov    %rdx,%rdi
  call   <fmt_2digits@plt>
  add    %rax,-0x8(%rbp)
  mov    -0x8(%rbp),%rax
  lea    0x1(%rax),%rdx
  mov    %rdx,-0x8(%rbp)
  mov    -0x18(%rbp),%rdx
  add    %rdx,%rax
  movb   $0x54,(%rax)
  mov    -0x10(%rbp),%rax
  mov    0xc(%rax),%eax
  mov    -0x18(%rbp),%rcx
  mov    -0x8(%rbp),%rdx
  add    %rcx,%rdx
  mov    %eax,%esi
  mov    %rdx,%rdi
  call   <fmt_2digits@plt>
  add    %rax,-0x8(%rbp)
  mov    -0x18(%rbp),%rdx
  mov    -0x8(%rbp),%rax
  add    %rdx,%rax
  lea    D12(%rip),%rdx
  mov    %rdx,%rsi
  mov    %rax,%rdi
  call   <fmt_str@plt>
  add    %rax,-0x8(%rbp)
  mov    -0x10(%rbp),%rax
  mov    0x10(%rax),%eax
  mov    -0x18(%rbp),%rcx
  mov    -0x8(%rbp),%rdx
  add    %rcx,%rdx
  mov    %eax,%esi
  mov    %rdx,%rdi
  call   <fmt_2digits@plt>
  add    %rax,-0x8(%rbp)
  mov    -0x18(%rbp),%rdx
  mov    -0x8(%rbp),%rax
  add    %rdx,%rax
  lea    D12(%rip),%rdx
  mov    %rdx,%rsi
  mov    %rax,%rdi
  call   <fmt_str@plt>
  add    %rax,-0x8(%rbp)
  mov    -0x10(%rbp),%rax
  mov    0x14(%rax),%eax
  mov    -0x18(%rbp),%rcx
  mov    -0x8(%rbp),%rdx
  add    %rcx,%rdx
  mov    %eax,%esi
  mov    %rdx,%rdi
  call   <fmt_2digits@plt>
  add    %rax,-0x8(%rbp)
  mov    -0x18(%rbp),%rdx
  mov    -0x8(%rbp),%rax
  add    %rdx,%rax
  lea    D8(%rip),%rdx
  mov    %rdx,%rsi
  mov    %rax,%rdi
  call   <fmt_str@plt>
  add    %rax,-0x8(%rbp)
  mov    -0x8(%rbp),%rax
L7:
  leave
  ret
```

tool_calls: name: unpack_data
arguments: tag: D12
type_infered: string
name: unpack_data
arguments: tag: D8
type_infered: string

tool: D12: :

tool: D8: Z

assistant: ```c
size_t fmt_iso8601(char *dest, time_t t) {
  struct tm *x = gmtime(&t);
  size_t i;
  if (dest == 0)
    return sizeof("2014-05-27T19:22:16Z") - 1;
  i = fmt_2digits(dest, (x->tm_year + 1900) / 100);
  i += fmt_2digits(dest + i, (x->tm_year + 1900) % 100);
  dest[i++] = '-';
  i += fmt_2digits(dest + i, x->tm_mon + 1);
  dest[i++] = '-';
  i += fmt_2digits(dest + i, x->tm_mday);
  dest[i++] = 'T';
  i += fmt_2digits(dest + i, x->tm_hour);
  i += fmt_str(dest + i, ":");
  i += fmt_2digits(dest + i, x->tm_min);
  i += fmt_str(dest + i, ":");
  i += fmt_2digits(dest + i, x->tm_sec);
  i += fmt_str(dest + i, "Z");
  return i;
}
```