user: What is the c source code of the assembly code below:

```asm
<aux_struct>:
  endbr64
  push   %rbp
  mov    %rsp,%rbp
  sub    $0x30,%rsp
  mov    %rdi,-0x28(%rbp)
  mov    -0x28(%rbp),%rax
  mov    %rax,%rdi
  call   <strlen@plt>
  add    $0x1,%eax
  mov    %eax,%edi
  call   <vrna_alloc@plt>
  mov    %rax,-0x10(%rbp)
  mov    -0x28(%rbp),%rax
  mov    %rax,%rdi
  call   <strlen@plt>
  mov    %eax,%edx
  shr    $0x1f,%edx
  add    %edx,%eax
  sar    %eax
  add    $0x1,%eax
  cltq
  add    %eax,%eax
  mov    %eax,%edi
  call   <vrna_alloc@plt>
  mov    %rax,-0x8(%rbp)
  mov    -0x28(%rbp),%rdx
  mov    -0x10(%rbp),%rax
  mov    %rdx,%rsi
  mov    %rax,%rdi
  call   <strcpy@plt>
  movl   $0x0,-0x18(%rbp)
  mov    -0x18(%rbp),%eax
  mov    %eax,-0x1c(%rbp)
  jmp    L50
L9:
  mov    -0x1c(%rbp),%eax
  movslq %eax,%rdx
  mov    -0x10(%rbp),%rax
  add    %rdx,%rax
  movzbl (%rax),%eax
  movsbl %al,%eax
  cmp    $0x2e,%eax
  je     L19
  cmp    $0x2e,%eax
  jg     L99
  cmp    $0x28,%eax
  je     L24
  cmp    $0x29,%eax
  je     L16
  jmp    L99
L24:
  addl   $0x1,-0x18(%rbp)
  mov    -0x18(%rbp),%eax
  cltq
  lea    (%rax,%rax,1),%rdx
  mov    -0x8(%rbp),%rax
  add    %rdx,%rax
  mov    -0x1c(%rbp),%edx
  mov    %dx,(%rax)
  jmp    L23
L16:
  mov    -0x1c(%rbp),%eax
  mov    %eax,-0x14(%rbp)
  jmp    L124
L43:
  addl   $0x1,-0x14(%rbp)
  subl   $0x1,-0x18(%rbp)
L124:
  mov    -0x14(%rbp),%eax
  cltq
  lea    0x1(%rax),%rdx
  mov    -0x10(%rbp),%rax
  add    %rdx,%rax
  movzbl (%rax),%eax
  cmp    $0x29,%al
  jne    L53
  mov    -0x18(%rbp),%eax
  cltq
  add    %rax,%rax
  lea    -0x2(%rax),%rdx
  mov    -0x8(%rbp),%rax
  add    %rdx,%rax
  movzwl (%rax),%eax
  cwtl
  mov    -0x18(%rbp),%edx
  movslq %edx,%rdx
  lea    (%rdx,%rdx,1),%rcx
  mov    -0x8(%rbp),%rdx
  add    %rcx,%rdx
  movzwl (%rdx),%edx
  movswl %dx,%edx
  sub    $0x1,%edx
  cmp    %edx,%eax
  je     L43
L53:
  mov    -0x14(%rbp),%eax
  movslq %eax,%rdx
  mov    -0x10(%rbp),%rax
  add    %rdx,%rax
  movb   $0x5d,(%rax)
  mov    -0x14(%rbp),%eax
  mov    %eax,-0x1c(%rbp)
  mov    -0x18(%rbp),%eax
  cltq
  lea    (%rax,%rax,1),%rdx
  mov    -0x8(%rbp),%rax
  add    %rdx,%rax
  movzwl (%rax),%eax
  movswq %ax,%rdx
  mov    -0x10(%rbp),%rax
  add    %rdx,%rax
  movb   $0x5b,(%rax)
  subl   $0x1,-0x18(%rbp)
  jmp    L23
L99:
  lea    D0(%rip),%rax
  mov    %rax,%rdi
  call   <vrna_message_error@plt>
  jmp    L23
L19:
  nop
L23:
  addl   $0x1,-0x1c(%rbp)
L50:
  mov    -0x1c(%rbp),%eax
  movslq %eax,%rdx
  mov    -0x10(%rbp),%rax
  add    %rdx,%rax
  movzbl (%rax),%eax
  test   %al,%al
  jne    L9
  mov    -0x8(%rbp),%rax
  mov    %rax,%rdi
  call   <free@plt>
  mov    -0x10(%rbp),%rax
  leave
  ret
```

tool_calls: name: extract_symbolic_data
arguments: data_label: D0
type_guessed: string

tool: D0: Junk in structure at aux_structure


assistant: ```c
char *aux_struct(const char *structure) {
  short *match_paren;
  int i, o, p;
  char *string;
  string = (char *)vrna_alloc(sizeof(char) * (strlen(structure) + 1));
  match_paren = (short *)vrna_alloc(sizeof(short) * (strlen(structure) / 2 + 1));
  strcpy(string, structure);
  i = o = 0;
  while (string[i]) {
    switch (string[i]) {
    case '.':
      break;
    case '(':
      match_paren[++o] = i;
      break;
    case ')':
      p = i;
      while ((string[p + 1] == ')') && (match_paren[o - 1] == match_paren[o] - 1)) {
        p++;
        o--;
      }
      string[p] = ']';
      i = p;
      string[match_paren[o]] = '[';
      o--;
      break;
    default:
      vrna_message_error("Junk in structure at aux_structure\n");
    }
    i++;
  }
  free(match_paren);
  return (string);
}
```