user: 请从给定的汇编指令推导出C源代码：

```asm
<unstringify>:
  endbr64
  push   %r15
  mov    $0x1,%esi
  push   %r14
  push   %r13
  push   %r12
  push   %rbp
  push   %rbx
  mov    %rdi,%rbx
  mov    $0x400,%edi
  sub    $0x8,%rsp
  call   <calloc@plt>
  mov    $0x400,%edx
  xor    %esi,%esi
  mov    %rax,%rdi
  mov    %rax,%r12
  call   <memset@plt>
  movzbl (%rbx),%ebp
  test   %bpl,%bpl
  je     L218
  xor    %edx,%edx
  xor    %r13d,%r13d
  xor    %r9d,%r9d
  xor    %r15d,%r15d
  nopl   (%rax)
L315:
  movslq %edx,%rcx
  lea    0x2(%rbx,%r9,1),%r8
  lea    0x1(%r13),%esi
  movzbl %bpl,%eax
  add    %r12,%rcx
  mov    %rcx,%rdi
  sub    %r8,%rdi
  cmp    $0xe,%rdi
  jbe    L185
  cmp    $0x7,%bpl
  jbe    L185
  test   %bpl,%bpl
  mov    $0x1,%r11d
  cmovne %eax,%r11d
  cmp    $0xf,%bpl
  jbe    L1
  lea    0x1(%rbx,%r9,1),%rdi
  mov    %r11d,%r8d
  movdqu (%rdi),%xmm0
  shr    $0x4,%r8d
  movups %xmm0,(%rcx)
  cmp    $0x1,%r8d
  je     L129
  movdqu 0x10(%rdi),%xmm1
  movups %xmm1,0x10(%rcx)
  cmp    $0x2,%r8d
  je     L129
  movdqu 0x20(%rdi),%xmm2
  movups %xmm2,0x20(%rcx)
  cmp    $0x3,%r8d
  je     L129
  movdqu 0x30(%rdi),%xmm3
  movups %xmm3,0x30(%rcx)
  cmp    $0x4,%r8d
  je     L129
  movdqu 0x40(%rdi),%xmm4
  movups %xmm4,0x40(%rcx)
  cmp    $0x5,%r8d
  je     L129
  movdqu 0x50(%rdi),%xmm5
  movups %xmm5,0x50(%rcx)
  cmp    $0x6,%r8d
  je     L129
  movdqu 0x60(%rdi),%xmm6
  movups %xmm6,0x60(%rcx)
  cmp    $0x7,%r8d
  je     L129
  movdqu 0x70(%rdi),%xmm7
  movups %xmm7,0x70(%rcx)
  cmp    $0x8,%r8d
  je     L129
  movdqu 0x80(%rdi),%xmm7
  movups %xmm7,0x80(%rcx)
  cmp    $0x9,%r8d
  je     L129
  movdqu 0x90(%rdi),%xmm6
  movups %xmm6,0x90(%rcx)
  cmp    $0xa,%r8d
  je     L129
  movdqu 0xa0(%rdi),%xmm5
  movups %xmm5,0xa0(%rcx)
  cmp    $0xb,%r8d
  je     L129
  movdqu 0xb0(%rdi),%xmm4
  movups %xmm4,0xb0(%rcx)
  cmp    $0xc,%r8d
  je     L129
  movdqu 0xc0(%rdi),%xmm7
  movups %xmm7,0xc0(%rcx)
  cmp    $0xd,%r8d
  je     L129
  movdqu 0xd0(%rdi),%xmm6
  movups %xmm6,0xd0(%rcx)
  cmp    $0xf,%r8d
  jne    L129
  movdqu 0xe0(%rdi),%xmm5
  movups %xmm5,0xe0(%rcx)
  nopl   0x0(%rax,%rax,1)
L129:
  mov    %r11d,%r8d
  and    $0xfffffff0,%r8d
  mov    %r8d,%edi
  add    %r8d,%esi
  lea    (%rdx,%r8,1),%r10d
  cmp    %r8d,%r11d
  je     L59
L264:
  sub    %r8d,%r11d
  lea    -0x1(%r11),%r14d
  cmp    $0x6,%r14d
  jbe    L182
  add    %rbx,%r9
  mov    0x1(%r8,%r9,1),%r9
  mov    %r9,(%rcx,%r8,1)
  mov    %r11d,%r8d
  and    $0xfffffff8,%r8d
  add    %r8d,%esi
  add    %r8d,%r10d
  add    %r8d,%edi
  cmp    %r8d,%r11d
  je     L59
L182:
  movslq %esi,%rcx
  lea    0x1(%rdi),%r9d
  movzbl (%rbx,%rcx,1),%r8d
  movslq %r10d,%rcx
  mov    %r8b,(%r12,%rcx,1)
  lea    0x1(%rsi),%r8d
  lea    0x1(%r10),%ecx
  cmp    %r9d,%eax
  jle    L59
  movslq %r8d,%r8
  movslq %ecx,%rcx
  lea    0x2(%rdi),%r9d
  movzbl (%rbx,%r8,1),%r8d
  mov    %r8b,(%r12,%rcx,1)
  lea    0x2(%rsi),%r8d
  lea    0x2(%r10),%ecx
  cmp    %r9d,%eax
  jle    L59
  movslq %r8d,%r8
  movslq %ecx,%rcx
  lea    0x3(%rdi),%r9d
  movzbl (%rbx,%r8,1),%r8d
  mov    %r8b,(%r12,%rcx,1)
  lea    0x3(%rsi),%r8d
  lea    0x3(%r10),%ecx
  cmp    %r9d,%eax
  jle    L59
  movslq %r8d,%r8
  movslq %ecx,%rcx
  lea    0x4(%rdi),%r9d
  movzbl (%rbx,%r8,1),%r8d
  mov    %r8b,(%r12,%rcx,1)
  lea    0x4(%rsi),%r8d
  lea    0x4(%r10),%ecx
  cmp    %r9d,%eax
  jle    L59
  movslq %r8d,%r8
  movslq %ecx,%rcx
  lea    0x5(%rdi),%r9d
  movzbl (%rbx,%r8,1),%r8d
  mov    %r8b,(%r12,%rcx,1)
  lea    0x5(%rsi),%r8d
  lea    0x5(%r10),%ecx
  cmp    %r9d,%eax
  jle    L59
  movslq %r8d,%r8
  movslq %ecx,%rcx
  add    $0x6,%edi
  add    $0x6,%esi
  movzbl (%rbx,%r8,1),%r8d
  mov    %r8b,(%r12,%rcx,1)
  lea    0x6(%r10),%ecx
  cmp    %edi,%eax
  jle    L59
  movslq %esi,%rsi
  movslq %ecx,%rcx
  movzbl (%rbx,%rsi,1),%esi
  mov    %sil,(%r12,%rcx,1)
L59:
  sub    $0x1,%eax
  test   %bpl,%bpl
  cmove  %r15d,%eax
  lea    0x2(%r13,%rax,1),%r13d
  lea    0x1(%rdx,%rax,1),%ecx
  add    %edx,%eax
  movslq %r13d,%r9
  lea    (%rbx,%r9,1),%rsi
  cmpb   $0x0,(%rsi)
  jne    L303
L218:
  add    $0x8,%rsp
  mov    %r12,%rax
  pop    %rbx
  pop    %rbp
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  ret
  nopw   0x0(%rax,%rax,1)
L303:
  movslq %ecx,%rcx
  lea    0x2(%rax),%edx
  movb   $0x2e,(%r12,%rcx,1)
  movzbl (%rsi),%ebp
  test   %bpl,%bpl
  jne    L315
  jmp    L218
  nopl   0x0(%rax)
L185:
  xor    %esi,%esi
  lea    (%rbx,%r9,1),%r8
  cs nopw 0x0(%rax,%rax,1)
L156:
  movzbl 0x1(%r8,%rsi,1),%edi
  mov    %dil,(%rcx,%rsi,1)
  add    $0x1,%rsi
  cmp    %esi,%eax
  jg     L156
  jmp    L59
L1:
  mov    %edx,%r10d
  xor    %r8d,%r8d
  xor    %edi,%edi
  jmp    L264
```

assistant: ```c
unsigned char *unstringify(unsigned char *str) {
  int i = 0;
  unsigned char *newstr = (unsigned char *)calloc(1024, sizeof(unsigned char));
  memset(newstr, 0, 1024);
  int charsInserted = 0;
  while (str[i] != 0x0) {
    int j = str[i];
    i++;
    for (int k = 0; k < j; k++) {
      newstr[charsInserted] = str[i];
      i++;
      charsInserted++;
    }
    if (str[i] != 0x0) {
      newstr[charsInserted] = '.';
      charsInserted++;
    }
  }
  return newstr;
}
```