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

```asm
<main>:
  endbr64
  push   %rbp
  mov    %rsp,%rbp
  sub    $0x20,%rsp
  mov    %fs:0x28,%rax
  mov    %rax,-0x8(%rbp)
  xor    %eax,%eax
  lea    D165(%rip),%rax
  mov    %rax,%rdi
  call   <puts@plt>
  lea    -0x20(%rbp),%rax
  mov    %rax,%rsi
  lea    D15(%rip),%rax
  mov    %rax,%rdi
  call   <stat@plt>
  cmp    $0xffffffff,%eax
  jne    L9
  lea    D134(%rip),%rax
  mov    %rax,%rdi
  call   <perror@plt>
  mov    $0x1,%edi
  call   <exit@plt>
L9:
  mov    -0x18(%rbp),%rax
  mov    %eax,%esi
  lea    D45(%rip),%rax
  mov    %rax,%rdi
  mov    $0x0,%eax
  call   <printf@plt>
  mov    -0x20(%rbp),%rax
  mov    %eax,%esi
  lea    D169(%rip),%rax
  mov    %rax,%rdi
  mov    $0x0,%eax
  call   <printf@plt>
  lea    -0x20(%rbp),%rax
  mov    %rax,%rsi
  lea    D5(%rip),%rax
  mov    %rax,%rdi
  call   <lstat@plt>
  cmp    $0xffffffff,%eax
  jne    L25
  lea    D134(%rip),%rax
  mov    %rax,%rdi
  call   <perror@plt>
  mov    $0x1,%edi
  call   <exit@plt>
L25:
  mov    -0x18(%rbp),%rax
  mov    %eax,%esi
  lea    D64(%rip),%rax
  mov    %rax,%rdi
  mov    $0x0,%eax
  call   <printf@plt>
  mov    -0x20(%rbp),%rax
  mov    %eax,%esi
  lea    D22(%rip),%rax
  mov    %rax,%rdi
  mov    $0x0,%eax
  call   <printf@plt>
  mov    $0xffffffff,%edx
  mov    $0x0,%esi
  lea    D5(%rip),%rax
  mov    %rax,%rdi
  call   <lchown@plt>
  cmp    $0xffffffff,%eax
  jne    L27
  lea    D173(%rip),%rax
  mov    %rax,%rdi
  call   <perror@plt>
  mov    $0x1,%edi
  call   <exit@plt>
L27:
  lea    D160(%rip),%rax
  mov    %rax,%rdi
  call   <puts@plt>
  lea    -0x20(%rbp),%rax
  mov    %rax,%rsi
  lea    D15(%rip),%rax
  mov    %rax,%rdi
  call   <stat@plt>
  cmp    $0xffffffff,%eax
  jne    L39
  lea    D134(%rip),%rax
  mov    %rax,%rdi
  call   <perror@plt>
  mov    $0x1,%edi
  call   <exit@plt>
L39:
  mov    -0x18(%rbp),%rax
  mov    %eax,%esi
  lea    D45(%rip),%rax
  mov    %rax,%rdi
  mov    $0x0,%eax
  call   <printf@plt>
  mov    -0x20(%rbp),%rax
  mov    %eax,%esi
  lea    D169(%rip),%rax
  mov    %rax,%rdi
  mov    $0x0,%eax
  call   <printf@plt>
  lea    -0x20(%rbp),%rax
  mov    %rax,%rsi
  lea    D5(%rip),%rax
  mov    %rax,%rdi
  call   <lstat@plt>
  cmp    $0xffffffff,%eax
  jne    L23
  lea    D134(%rip),%rax
  mov    %rax,%rdi
  call   <perror@plt>
  mov    $0x1,%edi
  call   <exit@plt>
L23:
  mov    -0x18(%rbp),%rax
  mov    %eax,%esi
  lea    D64(%rip),%rax
  mov    %rax,%rdi
  mov    $0x0,%eax
  call   <printf@plt>
  mov    -0x20(%rbp),%rax
  mov    %eax,%esi
  lea    D22(%rip),%rax
  mov    %rax,%rdi
  mov    $0x0,%eax
  call   <printf@plt>
  mov    $0x0,%eax
  mov    -0x8(%rbp),%rdx
  sub    %fs:0x28,%rdx
  je     L59
  call   <__stack_chk_fail@plt>
L59:
  leave
  ret
```

tool_calls: name: extract_symbolic_data
arguments: tag: D165
type: string
name: extract_symbolic_data
arguments: tag: D15
type: string
name: extract_symbolic_data
arguments: tag: D134
type: string
name: extract_symbolic_data
arguments: tag: D45
type: string
name: extract_symbolic_data
arguments: tag: D169
type: string
name: extract_symbolic_data
arguments: tag: D5
type: string
name: extract_symbolic_data
arguments: tag: D64
type: string
name: extract_symbolic_data
arguments: tag: D22
type: string
name: extract_symbolic_data
arguments: tag: D173
type: string
name: extract_symbolic_data
arguments: tag: D160
type: string

tool: D165: before changing

tool: D15: test.txt

tool: D134: fail to get status

tool: D45: the owner of test.txt is : %u


tool: D169: the group of test.txt is : %u


tool: D5: sl

tool: D64: the owner of sl is : %u


tool: D22: the group of sl is : %u


tool: D173: fail to change owner

tool: D160: after changing

assistant: ```c
int main(void) {
  struct stat statbuf;
  printf("before changing\n");
  if (stat("test.txt", &statbuf) == -1) {
    perror("fail to get status");
    exit(1);
  }
  printf("the owner of test.txt is : %u\n", (unsigned int)statbuf.st_uid);
  printf("the group of test.txt is : %u\n", (unsigned int)statbuf.st_gid);
  if (lstat("sl", &statbuf) == -1) {
    perror("fail to get status");
    exit(1);
  }
  printf("the owner of sl is : %u\n", (unsigned int)statbuf.st_uid);
  printf("the group of sl is : %u\n", (unsigned int)statbuf.st_gid);
  if (lchown("sl", 0, -1) == -1) {
    perror("fail to change owner");
    exit(1);
  }
  printf("after changing\n");
  if (stat("test.txt", &statbuf) == -1) {
    perror("fail to get status");
    exit(1);
  }
  printf("the owner of test.txt is : %u\n", (unsigned int)statbuf.st_uid);
  printf("the group of test.txt is : %u\n", (unsigned int)statbuf.st_gid);
  if (lstat("sl", &statbuf) == -1) {
    perror("fail to get status");
    exit(1);
  }
  printf("the owner of sl is : %u\n", (unsigned int)statbuf.st_uid);
  printf("the group of sl is : %u\n", (unsigned int)statbuf.st_gid);
  return 0;
}
```