user: 请将以下的汇编代码转换成C语言代码：

```asm
<unescape>:
  endbr64
  push   %rbp
  mov    %rsp,%rbp
  mov    %rdi,-0x18(%rbp)
  mov    %rsi,-0x20(%rbp)
  movq   $0x0,-0x10(%rbp)
  movq   $0x0,-0x8(%rbp)
  jmp    L16
L159:
  mov    -0x18(%rbp),%rdx
  mov    -0x10(%rbp),%rax
  add    %rdx,%rax
  movzbl (%rax),%eax
  cmp    $0x5c,%al
  je     L199
  mov    -0x18(%rbp),%rdx
  mov    -0x10(%rbp),%rax
  lea    (%rdx,%rax,1),%rcx
  mov    -0x8(%rbp),%rax
  lea    0x1(%rax),%rdx
  mov    %rdx,-0x8(%rbp)
  mov    -0x20(%rbp),%rdx
  add    %rax,%rdx
  movzbl (%rcx),%eax
  mov    %al,(%rdx)
  jmp    L30
L199:
  addq   $0x1,-0x10(%rbp)
  mov    -0x18(%rbp),%rdx
  mov    -0x10(%rbp),%rax
  add    %rdx,%rax
  movzbl (%rax),%eax
  movsbl %al,%eax
  cmp    $0x76,%eax
  jg     L163
  cmp    $0x3f,%eax
  jge    L121
  cmp    $0x22,%eax
  je     L69
  cmp    $0x27,%eax
  je     L184
  jmp    L163
L121:
  sub    $0x3f,%eax
  cmp    $0x37,%eax
  ja     L163
  mov    %eax,%eax
  lea    0x0(,%rax,4),%rdx
  lea    D18(%rip),%rax
  mov    (%rdx,%rax,1),%eax
  cltq
  lea    D18(%rip),%rdx
  add    %rdx,%rax
  notrack jmp *%rax
  mov    -0x8(%rbp),%rax
  lea    0x1(%rax),%rdx
  mov    %rdx,-0x8(%rbp)
  mov    -0x20(%rbp),%rdx
  add    %rdx,%rax
  movb   $0x7,(%rax)
  jmp    L30
  mov    -0x8(%rbp),%rax
  lea    0x1(%rax),%rdx
  mov    %rdx,-0x8(%rbp)
  mov    -0x20(%rbp),%rdx
  add    %rdx,%rax
  movb   $0x8,(%rax)
  jmp    L30
  mov    -0x8(%rbp),%rax
  lea    0x1(%rax),%rdx
  mov    %rdx,-0x8(%rbp)
  mov    -0x20(%rbp),%rdx
  add    %rdx,%rax
  movb   $0xc,(%rax)
  jmp    L30
  mov    -0x8(%rbp),%rax
  lea    0x1(%rax),%rdx
  mov    %rdx,-0x8(%rbp)
  mov    -0x20(%rbp),%rdx
  add    %rdx,%rax
  movb   $0xa,(%rax)
  jmp    L30
  mov    -0x8(%rbp),%rax
  lea    0x1(%rax),%rdx
  mov    %rdx,-0x8(%rbp)
  mov    -0x20(%rbp),%rdx
  add    %rdx,%rax
  movb   $0xd,(%rax)
  jmp    L30
  mov    -0x8(%rbp),%rax
  lea    0x1(%rax),%rdx
  mov    %rdx,-0x8(%rbp)
  mov    -0x20(%rbp),%rdx
  add    %rdx,%rax
  movb   $0x9,(%rax)
  jmp    L30
  mov    -0x8(%rbp),%rax
  lea    0x1(%rax),%rdx
  mov    %rdx,-0x8(%rbp)
  mov    -0x20(%rbp),%rdx
  add    %rdx,%rax
  movb   $0xb,(%rax)
  jmp    L30
L184:
  mov    -0x8(%rbp),%rax
  lea    0x1(%rax),%rdx
  mov    %rdx,-0x8(%rbp)
  mov    -0x20(%rbp),%rdx
  add    %rdx,%rax
  movb   $0x27,(%rax)
  jmp    L30
L69:
  mov    -0x8(%rbp),%rax
  lea    0x1(%rax),%rdx
  mov    %rdx,-0x8(%rbp)
  mov    -0x20(%rbp),%rdx
  add    %rdx,%rax
  movb   $0x22,(%rax)
  jmp    L30
  mov    -0x8(%rbp),%rax
  lea    0x1(%rax),%rdx
  mov    %rdx,-0x8(%rbp)
  mov    -0x20(%rbp),%rdx
  add    %rdx,%rax
  movb   $0x3f,(%rax)
  jmp    L30
L163:
  mov    -0x18(%rbp),%rdx
  mov    -0x10(%rbp),%rax
  lea    (%rdx,%rax,1),%rcx
  mov    -0x8(%rbp),%rax
  lea    0x1(%rax),%rdx
  mov    %rdx,-0x8(%rbp)
  mov    -0x20(%rbp),%rdx
  add    %rax,%rdx
  movzbl (%rcx),%eax
  mov    %al,(%rdx)
L30:
  mov    -0x20(%rbp),%rdx
  mov    -0x8(%rbp),%rax
  add    %rdx,%rax
  movb   $0x0,(%rax)
  addq   $0x1,-0x10(%rbp)
L16:
  mov    -0x18(%rbp),%rdx
  mov    -0x10(%rbp),%rax
  add    %rdx,%rax
  movzbl (%rax),%eax
  test   %al,%al
  jne    L159
  nop
  nop
  pop    %rbp
  ret
```

assistant: ```c
void unescape(char source[], char target[]) {
  size_t i;
  size_t j;
  for (i = 0, j = 0; source[i] != '\0'; i++) {
    if (source[i] != '\\')
      target[j++] = source[i];
    else
      switch (source[++i]) {
      case 'a':
        target[j++] = '\a';
        break;
      case 'b':
        target[j++] = '\b';
        break;
      case 'f':
        target[j++] = '\f';
        break;
      case 'n':
        target[j++] = '\n';
        break;
      case 'r':
        target[j++] = '\r';
        break;
      case 't':
        target[j++] = '\t';
        break;
      case 'v':
        target[j++] = '\v';
        break;
      case '\'':
        target[j++] = '\'';
        break;
      case '"':
        target[j++] = '\"';
        break;
      case '?':
        target[j++] = '\?';
        break;
      default:
        target[j++] = source[i];
      }
    target[j] = '\0';
  }
}
```