user: Demonstrate the C code that generates the assembly output below:

```asm
<entab>:
  endbr64
  push   %rbp
  mov    %rsp,%rbp
  sub    $0x40,%rsp
  mov    %rdi,-0x38(%rbp)
  mov    %esi,-0x3c(%rbp)
  movl   $0x0,-0x20(%rbp)
  movl   $0x0,-0x10(%rbp)
  movl   $0x0,-0xc(%rbp)
  movl   $0x0,-0x24(%rbp)
  movl   $0x0,-0x1c(%rbp)
  mov    -0x3c(%rbp),%eax
  add    $0x1,%eax
  mov    %eax,%edi
  call   <malloc@plt>
  mov    %rax,-0x8(%rbp)
  mov    -0x38(%rbp),%rdx
  mov    -0x8(%rbp),%rax
  mov    %rdx,%rsi
  mov    %rax,%rdi
  call   <strcpy@plt>
  jmp    L68
L60:
  mov    -0x24(%rbp),%eax
  movslq %eax,%rdx
  mov    -0x8(%rbp),%rax
  add    %rdx,%rax
  movzbl (%rax),%eax
  cmp    $0x20,%al
  jne    L35
  mov    -0x24(%rbp),%eax
  mov    %eax,-0x18(%rbp)
  nop
L121:
  mov    -0x18(%rbp),%eax
  lea    0x1(%rax),%edx
  mov    %edx,-0x18(%rbp)
  movslq %eax,%rdx
  mov    -0x8(%rbp),%rax
  add    %rdx,%rax
  movzbl (%rax),%eax
  cmp    $0x20,%al
  je     L121
  movl   $0x0,-0x10(%rbp)
  movl   $0x0,-0xc(%rbp)
  mov    -0x24(%rbp),%eax
  lea    0x8(%rax),%edx
  mov    -0x24(%rbp),%eax
  mov    %eax,%ecx
  sar    $0x1f,%ecx
  shr    $0x1d,%ecx
  add    %ecx,%eax
  and    $0x7,%eax
  sub    %ecx,%eax
  mov    %eax,%ecx
  mov    %edx,%eax
  sub    %ecx,%eax
  mov    %eax,-0x14(%rbp)
  mov    -0x18(%rbp),%eax
  cmp    -0x14(%rbp),%eax
  jge    L59
  mov    -0x18(%rbp),%eax
  sub    -0x24(%rbp),%eax
  cltd
  shr    $0x1d,%edx
  add    %edx,%eax
  and    $0x7,%eax
  sub    %edx,%eax
  mov    %eax,-0xc(%rbp)
  movl   $0x0,-0x20(%rbp)
  jmp    L48
L20:
  mov    -0x1c(%rbp),%eax
  lea    0x1(%rax),%edx
  mov    %edx,-0x1c(%rbp)
  movslq %eax,%rdx
  mov    -0x38(%rbp),%rax
  add    %rdx,%rax
  movb   $0x20,(%rax)
  addl   $0x1,-0x20(%rbp)
L48:
  mov    -0xc(%rbp),%eax
  sub    $0x1,%eax
  cmp    %eax,-0x20(%rbp)
  jl     L20
  jmp    L28
L65:
  addl   $0x1,-0x10(%rbp)
  addl   $0x8,-0x14(%rbp)
L59:
  mov    -0x14(%rbp),%eax
  cmp    -0x18(%rbp),%eax
  jle    L65
  movl   $0x0,-0x20(%rbp)
  jmp    L112
L32:
  mov    -0x1c(%rbp),%eax
  lea    0x1(%rax),%edx
  mov    %edx,-0x1c(%rbp)
  movslq %eax,%rdx
  mov    -0x38(%rbp),%rax
  add    %rdx,%rax
  movb   $0x9,(%rax)
  addl   $0x1,-0x20(%rbp)
L112:
  mov    -0x20(%rbp),%eax
  cmp    -0x10(%rbp),%eax
  jl     L32
  movl   $0x0,-0x20(%rbp)
  jmp    L58
L132:
  mov    -0x1c(%rbp),%eax
  lea    0x1(%rax),%edx
  mov    %edx,-0x1c(%rbp)
  movslq %eax,%rdx
  mov    -0x38(%rbp),%rax
  add    %rdx,%rax
  movb   $0x20,(%rax)
  addl   $0x1,-0x20(%rbp)
L58:
  mov    -0x18(%rbp),%eax
  sub    -0x14(%rbp),%eax
  add    $0x7,%eax
  cmp    %eax,-0x20(%rbp)
  jle    L132
L28:
  subl   $0x1,-0x18(%rbp)
  mov    -0x18(%rbp),%eax
  mov    %eax,-0x24(%rbp)
  jmp    L68
L35:
  mov    -0x24(%rbp),%eax
  lea    0x1(%rax),%edx
  mov    %edx,-0x24(%rbp)
  movslq %eax,%rdx
  mov    -0x8(%rbp),%rax
  lea    (%rdx,%rax,1),%rcx
  mov    -0x1c(%rbp),%eax
  lea    0x1(%rax),%edx
  mov    %edx,-0x1c(%rbp)
  movslq %eax,%rdx
  mov    -0x38(%rbp),%rax
  add    %rax,%rdx
  movzbl (%rcx),%eax
  mov    %al,(%rdx)
L68:
  mov    -0x24(%rbp),%eax
  movslq %eax,%rdx
  mov    -0x8(%rbp),%rax
  add    %rdx,%rax
  movzbl (%rax),%eax
  test   %al,%al
  jne    L60
  mov    -0x1c(%rbp),%eax
  movslq %eax,%rdx
  mov    -0x38(%rbp),%rax
  add    %rdx,%rax
  movb   $0x0,(%rax)
  nop
  leave
  ret
```

assistant: ```c
void entab(char *line, int len) {
  int i, m = 0, j, k, stop, nt = 0, nb = 0;
  i = 0;
  j = 0;
  char *copy = (char *)malloc(len + 1);
  strcpy(copy, line);
  while (copy[i] != '\0') {
    if (copy[i] == ' ') {
      k = i;
      while (copy[k++] == ' ')
        ;
      nt = 0;
      nb = 0;
      stop = i + 8 - i % 8;
      if (k < stop) {
        nb = (k - i) % 8;
        for (m = 0; m < nb - 1; m++) {
          line[j++] = ' ';
        }
      } else {
        while (stop <= k) {
          nt++;
          stop += 8;
        }
        for (m = 0; m < nt; m++) {
          line[j++] = '\t';
        }
        for (m = 0; m < k - stop + 8; m++) {
          line[j++] = ' ';
        }
      }
      i = --k;
    } else {
      line[j++] = copy[i++];
    }
  }
  line[j] = '\0';
}
```