user: Please show me the C implementation that matches the assembly code listed below:

```asm
<unimplemented>:
  endbr64
  push   %r12
  lea    D15(%rip),%rsi
  mov    %edi,%r12d
  push   %rbp
  sub    $0x418,%rsp
  mov    %fs:0x28,%rax
  mov    %rax,0x408(%rsp)
  xor    %eax,%eax
  mov    %rsp,%rbp
  mov    %rbp,%rdi
  call   <sprintf@plt>
  lea    D38(%rip),%rsi
  mov    %rbp,%rdi
  call   <sprintf@plt>
  mov    %rbp,%rdi
  call   <strlen@plt>
  xor    %ecx,%ecx
  mov    %rbp,%rsi
  mov    %r12d,%edi
  mov    %eax,%edx
  call   <send@plt>
  lea    D30(%rip),%rsi
  mov    %rbp,%rdi
  call   <sprintf@plt>
  mov    %rbp,%rdi
  call   <strlen@plt>
  xor    %ecx,%ecx
  mov    %rbp,%rsi
  mov    %r12d,%edi
  mov    %eax,%edx
  call   <send@plt>
  lea    D70(%rip),%rsi
  mov    %rbp,%rdi
  call   <sprintf@plt>
  mov    %rbp,%rdi
  call   <strlen@plt>
  xor    %ecx,%ecx
  mov    %rbp,%rsi
  mov    %r12d,%edi
  mov    %eax,%edx
  call   <send@plt>
  lea    D64(%rip),%rsi
  mov    %rbp,%rdi
  call   <sprintf@plt>
  mov    %rbp,%rdi
  call   <strlen@plt>
  xor    %ecx,%ecx
  mov    %rbp,%rsi
  mov    %r12d,%edi
  mov    %eax,%edx
  call   <send@plt>
  lea    D29(%rip),%rsi
  mov    %rbp,%rdi
  call   <sprintf@plt>
  mov    %rbp,%rdi
  call   <strlen@plt>
  xor    %ecx,%ecx
  mov    %rbp,%rsi
  mov    %r12d,%edi
  mov    %eax,%edx
  call   <send@plt>
  lea    D12(%rip),%rsi
  mov    %rbp,%rdi
  call   <sprintf@plt>
  mov    %rbp,%rdi
  call   <strlen@plt>
  xor    %ecx,%ecx
  mov    %rbp,%rsi
  mov    %r12d,%edi
  mov    %eax,%edx
  call   <send@plt>
  lea    D17(%rip),%rsi
  mov    %rbp,%rdi
  call   <sprintf@plt>
  mov    %rbp,%rdi
  call   <strlen@plt>
  xor    %ecx,%ecx
  mov    %rbp,%rsi
  mov    %r12d,%edi
  mov    %eax,%edx
  call   <send@plt>
  mov    0x408(%rsp),%rax
  sub    %fs:0x28,%rax
  jne    L4
  add    $0x418,%rsp
  pop    %rbp
  pop    %r12
  ret
L4:
  call   <__stack_chk_fail@plt>
```

tool_calls: name: extract_symbolic_data
arguments: data_tag: D15
data_type: string
name: extract_symbolic_data
arguments: data_tag: D38
data_type: string
name: extract_symbolic_data
arguments: data_tag: D30
data_type: string
name: extract_symbolic_data
arguments: data_tag: D70
data_type: string
name: extract_symbolic_data
arguments: data_tag: D64
data_type: string
name: extract_symbolic_data
arguments: data_tag: D29
data_type: string
name: extract_symbolic_data
arguments: data_tag: D12
data_type: string
name: extract_symbolic_data
arguments: data_tag: D17
data_type: string

tool: D15: HTTP/1.0 501 Method Not Implemented


tool: D38: Server: tinyhttpd/0.1.0


tool: D30: Content-Type: text/html


tool: D70: 


tool: D64: <HTML><HEAD><TITLE>Method Not Implemented


tool: D29: </TITLE></HEAD>


tool: D12: <BODY><P>HTTP request method not supported.


tool: D17: </BODY></HTML>


assistant: ```c
void unimplemented(int fd) {
  char buf[1024];
  sprintf(buf, "HTTP/1.0 501 Method Not Implemented\r\n");
  sprintf(buf, "Server: tinyhttpd/0.1.0\r\n");
  send(fd, buf, strlen(buf), 0);
  sprintf(buf, "Content-Type: text/html\r\n");
  send(fd, buf, strlen(buf), 0);
  sprintf(buf, "\r\n");
  send(fd, buf, strlen(buf), 0);
  sprintf(buf, "<HTML><HEAD><TITLE>Method Not Implemented\r\n");
  send(fd, buf, strlen(buf), 0);
  sprintf(buf, "</TITLE></HEAD>\r\n");
  send(fd, buf, strlen(buf), 0);
  sprintf(buf, "<BODY><P>HTTP request method not supported.\r\n");
  send(fd, buf, strlen(buf), 0);
  sprintf(buf, "</BODY></HTML>\r\n");
  send(fd, buf, strlen(buf), 0);
}
```