user: Translate the below assembly code into C programming language:

```asm
<main>:
  endbr64
  push   %rbp
  mov    %rsp,%rbp
  sub    $0x30,%rsp
  mov    %edi,-0x24(%rbp)
  mov    %rsi,-0x30(%rbp)
  mov    %fs:0x28,%rax
  mov    %rax,-0x8(%rbp)
  xor    %eax,%eax
  cmpl   $0x2,-0x24(%rbp)
  sete   %al
  movzbl %al,%eax
  mov    %eax,%edi
  call   <assert@plt>
  mov    -0x30(%rbp),%rax
  add    $0x8,%rax
  mov    (%rax),%rax
  mov    %rax,%rdi
  call   <strlen@plt>
  mov    %eax,-0x1c(%rbp)
  mov    -0x1c(%rbp),%eax
  mov    %eax,%edi
  call   <assert@plt>
  mov    $0x0,%edi
  call   <close@plt>
  mov    $0x1,%edi
  call   <close@plt>
  mov    D40(%rip),%rax
  mov    (%rax),%esi
  mov    D24(%rip),%rax
  mov    (%rax),%eax
  lea    -0x10(%rbp),%rdx
  mov    %rdx,%rcx
  mov    $0x0,%edx
  mov    %eax,%edi
  call   <socketpair@plt>
  test   %rax,%rax
  sete   %al
  movzbl %al,%eax
  mov    %eax,%edi
  call   <assert@plt>
  mov    -0x10(%rbp),%eax
  test   %eax,%eax
  sete   %al
  movzbl %al,%eax
  mov    %eax,%edi
  call   <assert@plt>
  mov    -0xc(%rbp),%eax
  cmp    $0x1,%eax
  sete   %al
  movzbl %al,%eax
  mov    %eax,%edi
  call   <assert@plt>
  mov    $0x0,%eax
  call   <fork@plt>
  mov    %rax,-0x18(%rbp)
  mov    -0x18(%rbp),%rax
  not    %rax
  shr    $0x3f,%rax
  movzbl %al,%eax
  mov    %eax,%edi
  call   <assert@plt>
  cmpq   $0x0,-0x18(%rbp)
  je     L16
  mov    $0x1,%edi
  call   <close@plt>
  test   %rax,%rax
  sete   %al
  movzbl %al,%eax
  mov    %eax,%edi
  call   <assert@plt>
  mov    -0x30(%rbp),%rax
  add    $0x8,%rax
  mov    (%rax),%rax
  mov    -0x1c(%rbp),%edx
  mov    %edx,%esi
  mov    %rax,%rdi
  call   <transpose@plt>
  mov    D27(%rip),%rax
  mov    (%rax),%ecx
  mov    -0x30(%rbp),%rax
  add    $0x8,%rax
  mov    (%rax),%rax
  mov    -0x1c(%rbp),%edx
  mov    $0x0,%r9d
  mov    $0x0,%r8d
  mov    %rax,%rsi
  mov    $0x0,%edi
  call   <sendto@plt>
  cmp    %eax,-0x1c(%rbp)
  sete   %al
  movzbl %al,%eax
  mov    %eax,%edi
  call   <assert@plt>
  mov    D63(%rip),%rax
  mov    (%rax),%ecx
  mov    -0x30(%rbp),%rax
  add    $0x8,%rax
  mov    (%rax),%rax
  mov    -0x1c(%rbp),%edx
  mov    $0x0,%r9d
  mov    $0x0,%r8d
  mov    %rax,%rsi
  mov    $0x0,%edi
  call   <recvfrom@plt>
  cmp    %eax,-0x1c(%rbp)
  sete   %al
  movzbl %al,%eax
  mov    %eax,%edi
  call   <assert@plt>
  mov    $0x0,%edi
  call   <close@plt>
  test   %rax,%rax
  sete   %al
  movzbl %al,%eax
  mov    %eax,%edi
  call   <assert@plt>
  lea    -0x20(%rbp),%rcx
  mov    -0x18(%rbp),%rax
  mov    $0x0,%edx
  mov    %rcx,%rsi
  mov    %rax,%rdi
  call   <waitpid@plt>
  cmp    %rax,-0x18(%rbp)
  sete   %al
  movzbl %al,%eax
  mov    %eax,%edi
  call   <assert@plt>
  mov    -0x20(%rbp),%eax
  test   %eax,%eax
  sete   %al
  movzbl %al,%eax
  mov    %eax,%edi
  call   <assert@plt>
  jmp    L9
L16:
  mov    $0x0,%edi
  call   <close@plt>
  test   %rax,%rax
  sete   %al
  movzbl %al,%eax
  mov    %eax,%edi
  call   <assert@plt>
  mov    D63(%rip),%rax
  mov    (%rax),%ecx
  mov    -0x30(%rbp),%rax
  add    $0x8,%rax
  mov    (%rax),%rax
  mov    -0x1c(%rbp),%edx
  mov    $0x0,%r9d
  mov    $0x0,%r8d
  mov    %rax,%rsi
  mov    $0x1,%edi
  call   <recvfrom@plt>
  cmp    %eax,-0x1c(%rbp)
  sete   %al
  movzbl %al,%eax
  mov    %eax,%edi
  call   <assert@plt>
  mov    -0x30(%rbp),%rax
  add    $0x8,%rax
  mov    (%rax),%rax
  mov    -0x1c(%rbp),%edx
  mov    %edx,%esi
  mov    %rax,%rdi
  call   <transpose@plt>
  mov    D27(%rip),%rax
  mov    (%rax),%ecx
  mov    -0x30(%rbp),%rax
  add    $0x8,%rax
  mov    (%rax),%rax
  mov    -0x1c(%rbp),%edx
  mov    $0x0,%r9d
  mov    $0x0,%r8d
  mov    %rax,%rsi
  mov    $0x1,%edi
  call   <sendto@plt>
  cmp    %eax,-0x1c(%rbp)
  sete   %al
  movzbl %al,%eax
  mov    %eax,%edi
  call   <assert@plt>
  mov    D63(%rip),%rax
  mov    (%rax),%ecx
  mov    -0x30(%rbp),%rax
  add    $0x8,%rax
  mov    (%rax),%rax
  mov    -0x1c(%rbp),%edx
  mov    $0x0,%r9d
  mov    $0x0,%r8d
  mov    %rax,%rsi
  mov    $0x1,%edi
  call   <recvfrom@plt>
  test   %eax,%eax
  sete   %al
  movzbl %al,%eax
  mov    %eax,%edi
  call   <assert@plt>
  mov    $0x1,%edi
  call   <close@plt>
  test   %rax,%rax
  sete   %al
  movzbl %al,%eax
  mov    %eax,%edi
  call   <assert@plt>
L9:
  mov    $0x0,%eax
  mov    -0x8(%rbp),%rdx
  sub    %fs:0x28,%rdx
  je     L3
  call   <__stack_chk_fail@plt>
L3:
  leave
  ret
```

assistant: ```c
int main(int ac, char **av) {
  assert(ac == 2);
  const int len = strlen(av[1]);
  assert(len);
  (void)close(0);
  (void)close(1);
  int sv[2];
  assert(socketpair(AF_UNIX, SOCK_STREAM, 0, sv) == 0);
  assert(sv[0] == 0);
  assert(sv[1] == 1);
  pid_t pid = fork();
  assert(pid >= 0);
  if (pid) {
    assert(close(1) == 0);
    transpose(av[1], len);
    assert(sendto(0, av[1], len, MSG_DONTROUTE, NULL, 0) == len);
    assert(recvfrom(0, av[1], len, MSG_WAITALL, NULL, NULL) == len);
    assert(close(0) == 0);
    int status;
    assert(waitpid(pid, &status, 0) == pid);
    assert(status == 0);
  } else {
    assert(close(0) == 0);
    assert(recvfrom(1, av[1], len, MSG_WAITALL, NULL, NULL) == len);
    transpose(av[1], len);
    assert(sendto(1, av[1], len, MSG_DONTROUTE, NULL, 0) == len);
    assert(recvfrom(1, av[1], len, MSG_WAITALL, NULL, NULL) == 0);
    assert(close(1) == 0);
  }
  return 0;
}
```