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

```asm
<make_window8>:
  endbr64
  push   %r15
  push   %r14
  push   %r13
  push   %r12
  push   %rbp
  push   %rbx
  sub    $0x30,%rsp
  mov    %rdi,%rbx
  mov    %esi,%ebp
  mov    %edx,%r14d
  mov    %rcx,0x20(%rsp)
  cmp    $0x1,%r8b
  sbb    %r12d,%r12d
  and    $0x3,%r12d
  add    $0xc,%r12d
  neg    %r8b
  sbb    %al,%al
  add    $0x8,%eax
  mov    %al,0x1b(%rsp)
  lea    -0x1(%rsi),%eax
  push   $0x0
  mov    %eax,0x1c(%rsp)
  mov    %eax,%r9d
  mov    $0x0,%r8d
  mov    $0x0,%ecx
  mov    $0x8,%edx
  mov    $0x0,%eax
  call   <boxfill8@plt>
  lea    -0x2(%rbp),%r15d
  movl   $0x1,(%rsp)
  mov    %r15d,%r9d
  mov    $0x1,%r8d
  mov    $0x1,%ecx
  mov    $0x7,%edx
  mov    %ebp,%esi
  mov    %rbx,%rdi
  mov    $0x0,%eax
  call   <boxfill8@plt>
  lea    -0x1(%r14),%r13d
  mov    %r13d,(%rsp)
  mov    $0x0,%r9d
  mov    $0x0,%r8d
  mov    $0x0,%ecx
  mov    $0x8,%edx
  mov    %ebp,%esi
  mov    %rbx,%rdi
  mov    $0x0,%eax
  call   <boxfill8@plt>
  mov    %r14d,0x24(%rsp)
  sub    $0x2,%r14d
  mov    %r14d,(%rsp)
  mov    $0x1,%r9d
  mov    $0x1,%r8d
  mov    $0x1,%ecx
  mov    $0x7,%edx
  mov    %ebp,%esi
  mov    %rbx,%rdi
  mov    $0x0,%eax
  call   <boxfill8@plt>
  mov    %r14d,(%rsp)
  mov    %r15d,%r9d
  mov    $0x1,%r8d
  mov    %r15d,%ecx
  mov    $0xf,%edx
  mov    %ebp,%esi
  mov    %rbx,%rdi
  mov    $0x0,%eax
  call   <boxfill8@plt>
  mov    %r13d,(%rsp)
  mov    0x1c(%rsp),%eax
  mov    %eax,%r9d
  mov    $0x0,%r8d
  mov    %eax,%ecx
  mov    $0x0,%edx
  mov    %ebp,%esi
  mov    %rbx,%rdi
  mov    $0x0,%eax
  call   <boxfill8@plt>
  mov    0x24(%rsp),%eax
  sub    $0x3,%eax
  mov    %eax,(%rsp)
  lea    -0x3(%rbp),%r9d
  mov    $0x2,%r8d
  mov    $0x2,%ecx
  mov    $0x8,%edx
  mov    %ebp,%esi
  mov    %rbx,%rdi
  mov    $0x0,%eax
  call   <boxfill8@plt>
  movsbl %r12b,%edx
  movl   $0x14,(%rsp)
  lea    -0x4(%rbp),%r9d
  mov    $0x3,%r8d
  mov    $0x3,%ecx
  mov    %ebp,%esi
  mov    %rbx,%rdi
  mov    $0x0,%eax
  call   <boxfill8@plt>
  mov    %r14d,(%rsp)
  mov    %r15d,%r9d
  mov    %r14d,%r8d
  mov    $0x1,%ecx
  mov    $0xf,%edx
  mov    %ebp,%esi
  mov    %rbx,%rdi
  mov    $0x0,%eax
  call   <boxfill8@plt>
  mov    %r13d,(%rsp)
  mov    0x1c(%rsp),%r9d
  mov    %r13d,%r8d
  mov    $0x0,%ecx
  mov    $0x0,%edx
  mov    %ebp,%esi
  mov    %rbx,%rdi
  mov    $0x0,%eax
  call   <boxfill8@plt>
  mov    0x28(%rsp),%r9
  movsbl 0x23(%rsp),%r8d
  mov    $0x4,%ecx
  mov    $0x18,%edx
  mov    %ebp,%esi
  mov    %rbx,%rdi
  mov    $0x0,%eax
  call   <putfonts8_asc@plt>
  movslq %ebp,%r9
  lea    0x0(%rbp,%rbp,4),%eax
  cltq
  add    %r9,%rax
  add    %rax,%rbx
  lea    D9(%rip),%rsi
  lea    0xe0(%rsi),%r10
  add    $0x10,%rsp
  mov    $0x0,%edi
  mov    $0xf,%r8d
  jmp    L55
L47:
  mov    %dl,-0x15(%rbx,%rax,1)
  add    $0x1,%rax
  cmp    $0x10,%rax
  je     L65
L51:
  movzbl (%rsi,%rax,1),%ecx
  mov    %edi,%edx
  cmp    $0x40,%cl
  je     L47
  mov    %r8d,%edx
  cmp    $0x24,%cl
  je     L47
  cmp    $0x51,%cl
  sete   %dl
  add    $0x7,%edx
  jmp    L47
L65:
  add    %r9,%rbx
  add    $0x10,%rsi
  cmp    %r10,%rsi
  je     L6
L55:
  mov    $0x0,%eax
  jmp    L51
L6:
  add    $0x28,%rsp
  pop    %rbx
  pop    %rbp
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  ret
```

assistant: ```c
void make_window8(unsigned char *buf, int xsize, int ysize, char *title, char act) {
  static char closebtn[14][16] = {"OOOOOOOOOOOOOOO@", "OQQQQQQQQQQQQQ$@", "OQQQQQQQQQQQQQ$@", "OQQQ@@QQQQ@@QQ$@", "OQQQQ@@QQ@@QQQ$@", "OQQQQQ@@@@QQQQ$@", "OQQQQQQ@@QQQQQ$@", "OQQQQQ@@@@QQQQ$@", "OQQQQ@@QQ@@QQQ$@", "OQQQ@@QQQQ@@QQ$@", "OQQQQQQQQQQQQQ$@", "OQQQQQQQQQQQQQ$@", "O$$$$$$$$$$$$$$@", "@@@@@@@@@@@@@@@@"};
  int x, y;
  char c, tc, tbc;
  if (act != 0) {
    tc = 7;
    tbc = 12;
  } else {
    tc = 8;
    tbc = 15;
  }
  boxfill8(buf, xsize, 8, 0, 0, xsize - 1, 0);
  boxfill8(buf, xsize, 7, 1, 1, xsize - 2, 1);
  boxfill8(buf, xsize, 8, 0, 0, 0, ysize - 1);
  boxfill8(buf, xsize, 7, 1, 1, 1, ysize - 2);
  boxfill8(buf, xsize, 15, xsize - 2, 1, xsize - 2, ysize - 2);
  boxfill8(buf, xsize, 0, xsize - 1, 0, xsize - 1, ysize - 1);
  boxfill8(buf, xsize, 8, 2, 2, xsize - 3, ysize - 3);
  boxfill8(buf, xsize, tbc, 3, 3, xsize - 4, 20);
  boxfill8(buf, xsize, 15, 1, ysize - 2, xsize - 2, ysize - 2);
  boxfill8(buf, xsize, 0, 0, ysize - 1, xsize - 1, ysize - 1);
  putfonts8_asc(buf, xsize, 24, 4, tc, title);
  for (y = 0; y < 14; y++) {
    for (x = 0; x < 16; x++) {
      c = closebtn[y][x];
      if (c == '@') {
        c = 0;
      } else if (c == '$') {
        c = 15;
      } else if (c == 'Q') {
        c = 8;
      } else {
        c = 7;
      }
      buf[(5 + y) * xsize + (xsize - 21 + x)] = c;
    }
  }
  return;
}
```