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

```asm
<copy_options>:
  endbr64
  push   %rbp
  mov    %rsp,%rbp
  sub    $0x20,%rsp
  mov    %rdi,-0x18(%rbp)
  mov    %rsi,-0x20(%rbp)
  movl   $0xffffffff,-0x10(%rbp)
  movl   $0x0,-0xc(%rbp)
  mov    -0x18(%rbp),%rax
  mov    (%rax),%rax
  mov    %rax,-0x8(%rbp)
  jmp    L141
L67:
  cmpl   $0x0,-0xc(%rbp)
  jne    L68
  mov    -0x10(%rbp),%eax
  movslq %eax,%rdx
  mov    -0x20(%rbp),%rax
  add    %rdx,%rax
  movzbl (%rax),%eax
  movsbl %al,%eax
  mov    %eax,%edi
  call   <isblank@plt>
  test   %rax,%rax
  je     L55
  jmp    L141
L55:
  mov    -0x10(%rbp),%eax
  movslq %eax,%rdx
  mov    -0x20(%rbp),%rax
  add    %rdx,%rax
  movzbl (%rax),%eax
  cmp    $0x22,%al
  jne    L132
  movl   $0x2,-0xc(%rbp)
  mov    -0x8(%rbp),%rax
  lea    0x1(%rax),%rdx
  mov    %rdx,-0x8(%rbp)
  movb   $0x20,(%rax)
  mov    -0x8(%rbp),%rax
  lea    0x1(%rax),%rdx
  mov    %rdx,-0x8(%rbp)
  movb   $0x22,(%rax)
  jmp    L141
L132:
  mov    -0x8(%rbp),%rax
  lea    0x1(%rax),%rdx
  mov    %rdx,-0x8(%rbp)
  movb   $0x20,(%rax)
  mov    -0x8(%rbp),%rax
  lea    0x1(%rax),%rdx
  mov    %rdx,-0x8(%rbp)
  movb   $0x22,(%rax)
  movl   $0x1,-0xc(%rbp)
L68:
  cmpl   $0x1,-0xc(%rbp)
  jne    L44
  mov    -0x10(%rbp),%eax
  movslq %eax,%rdx
  mov    -0x20(%rbp),%rax
  add    %rdx,%rax
  movzbl (%rax),%eax
  movsbl %al,%eax
  mov    %eax,%edi
  call   <isblank@plt>
  test   %rax,%rax
  je     L44
  mov    -0x8(%rbp),%rax
  lea    0x1(%rax),%rdx
  mov    %rdx,-0x8(%rbp)
  movb   $0x22,(%rax)
  movl   $0x0,-0xc(%rbp)
  jmp    L141
L44:
  mov    -0x10(%rbp),%eax
  movslq %eax,%rdx
  mov    -0x20(%rbp),%rax
  add    %rdx,%rax
  movzbl (%rax),%eax
  cmp    $0x22,%al
  jne    L62
  mov    -0x8(%rbp),%rax
  lea    0x1(%rax),%rdx
  mov    %rdx,-0x8(%rbp)
  movb   $0x22,(%rax)
  cmpl   $0x1,-0xc(%rbp)
  jne    L26
  mov    -0x8(%rbp),%rax
  lea    0x1(%rax),%rdx
  mov    %rdx,-0x8(%rbp)
  movb   $0x20,(%rax)
  mov    -0x8(%rbp),%rax
  lea    0x1(%rax),%rdx
  mov    %rdx,-0x8(%rbp)
  movb   $0x22,(%rax)
  movl   $0x2,-0xc(%rbp)
  jmp    L141
L26:
  movl   $0x0,-0xc(%rbp)
  jmp    L141
L62:
  mov    -0x10(%rbp),%eax
  movslq %eax,%rdx
  mov    -0x20(%rbp),%rax
  lea    (%rdx,%rax,1),%rcx
  mov    -0x8(%rbp),%rax
  lea    0x1(%rax),%rdx
  mov    %rdx,-0x8(%rbp)
  movzbl (%rcx),%edx
  mov    %dl,(%rax)
L141:
  addl   $0x1,-0x10(%rbp)
  mov    -0x20(%rbp),%rax
  mov    %rax,%rdi
  call   <strlen@plt>
  cmp    %eax,-0x10(%rbp)
  jl     L67
  cmpl   $0x0,-0xc(%rbp)
  je     L1
  mov    -0x8(%rbp),%rax
  lea    0x1(%rax),%rdx
  mov    %rdx,-0x8(%rbp)
  movb   $0x22,(%rax)
L1:
  mov    -0x18(%rbp),%rax
  mov    -0x8(%rbp),%rdx
  mov    %rdx,(%rax)
  nop
  leave
  ret
```

assistant: ```c
void copy_options(char **dst, char *src) {
  int i = -1;
  int j = 0;
  char *s = *dst;
  while (++i < (int)strlen(src)) {
    if (!j) {
      if (isblank(src[i]))
        continue;
      if (src[i] == '"') {
        j = 2;
        *s++ = ' ';
        *s++ = '"';
        continue;
      }
      *s++ = ' ';
      *s++ = '"';
      j = 1;
    }
    if (j == 1 && isblank(src[i])) {
      *s++ = '"';
      j = 0;
      continue;
    }
    if (src[i] == '"') {
      *s++ = '"';
      if (j == 1) {
        *s++ = ' ';
        *s++ = '"';
        j = 2;
      } else
        j = 0;
      continue;
    }
    *s++ = src[i];
  }
  if (j)
    *s++ = '"';
  *dst = s;
}
```