user: Converte this assembly snippet into its equivalent C code:

```asm
<merge>:
  endbr64
  push   %rbp
  mov    %rsp,%rbp
  push   %r15
  push   %r14
  push   %r13
  push   %r12
  sub    $0x60,%rsp
  mov    %rdi,-0x68(%rbp)
  mov    %esi,-0x6c(%rbp)
  mov    %edx,-0x70(%rbp)
  mov    %ecx,-0x74(%rbp)
  mov    %fs:0x28,%rax
  mov    %rax,-0x28(%rbp)
  xor    %eax,%eax
  mov    %rsp,%rax
  mov    %rax,%rsi
  mov    -0x70(%rbp),%eax
  sub    -0x6c(%rbp),%eax
  add    $0x1,%eax
  mov    %eax,-0x50(%rbp)
  mov    -0x74(%rbp),%eax
  sub    -0x70(%rbp),%eax
  mov    %eax,-0x4c(%rbp)
  mov    -0x50(%rbp),%eax
  movslq %eax,%rdx
  sub    $0x1,%rdx
  mov    %rdx,-0x48(%rbp)
  movslq %eax,%rdx
  mov    %rdx,%r14
  mov    $0x0,%r15d
  movslq %eax,%rdx
  mov    %rdx,%r12
  mov    $0x0,%r13d
  cltq
  lea    0x0(,%rax,4),%rdx
  mov    $0x10,%eax
  sub    $0x1,%rax
  add    %rdx,%rax
  mov    $0x10,%edi
  mov    $0x0,%edx
  div    %rdi
  imul   $0x10,%rax,%rax
  mov    %rax,%rcx
  and    $0xfffffffffffff000,%rcx
  mov    %rsp,%rdx
  sub    %rcx,%rdx
L136:
  cmp    %rdx,%rsp
  je     L160
  sub    $0x1000,%rsp
  orq    $0x0,0xff8(%rsp)
  jmp    L136
L160:
  mov    %rax,%rdx
  and    $0xfff,%edx
  sub    %rdx,%rsp
  mov    %rax,%rdx
  and    $0xfff,%edx
  test   %rdx,%rdx
  je     L146
  and    $0xfff,%eax
  sub    $0x8,%rax
  add    %rsp,%rax
  orq    $0x0,(%rax)
L146:
  mov    %rsp,%rax
  add    $0x3,%rax
  shr    $0x2,%rax
  shl    $0x2,%rax
  mov    %rax,-0x40(%rbp)
  mov    -0x4c(%rbp),%eax
  movslq %eax,%rdx
  sub    $0x1,%rdx
  mov    %rdx,-0x38(%rbp)
  movslq %eax,%rdx
  mov    %rdx,%r10
  mov    $0x0,%r11d
  movslq %eax,%rdx
  mov    %rdx,%r8
  mov    $0x0,%r9d
  cltq
  lea    0x0(,%rax,4),%rdx
  mov    $0x10,%eax
  sub    $0x1,%rax
  add    %rdx,%rax
  mov    $0x10,%edi
  mov    $0x0,%edx
  div    %rdi
  imul   $0x10,%rax,%rax
  mov    %rax,%rcx
  and    $0xfffffffffffff000,%rcx
  mov    %rsp,%rdx
  sub    %rcx,%rdx
L120:
  cmp    %rdx,%rsp
  je     L66
  sub    $0x1000,%rsp
  orq    $0x0,0xff8(%rsp)
  jmp    L120
L66:
  mov    %rax,%rdx
  and    $0xfff,%edx
  sub    %rdx,%rsp
  mov    %rax,%rdx
  and    $0xfff,%edx
  test   %rdx,%rdx
  je     L47
  and    $0xfff,%eax
  sub    $0x8,%rax
  add    %rsp,%rax
  orq    $0x0,(%rax)
L47:
  mov    %rsp,%rax
  add    $0x3,%rax
  shr    $0x2,%rax
  shl    $0x2,%rax
  mov    %rax,-0x30(%rbp)
  movl   $0x0,-0x5c(%rbp)
  jmp    L134
L186:
  mov    -0x6c(%rbp),%edx
  mov    -0x5c(%rbp),%eax
  add    %edx,%eax
  movslq %eax,%rdx
  mov    -0x68(%rbp),%rax
  add    %rdx,%rax
  movzbl (%rax),%eax
  movsbl %al,%ecx
  mov    -0x40(%rbp),%rax
  mov    -0x5c(%rbp),%edx
  movslq %edx,%rdx
  mov    %ecx,(%rax,%rdx,4)
  addl   $0x1,-0x5c(%rbp)
L134:
  mov    -0x5c(%rbp),%eax
  cmp    -0x50(%rbp),%eax
  jl     L186
  movl   $0x0,-0x5c(%rbp)
  jmp    L83
L174:
  mov    -0x70(%rbp),%edx
  mov    -0x5c(%rbp),%eax
  add    %edx,%eax
  cltq
  lea    0x1(%rax),%rdx
  mov    -0x68(%rbp),%rax
  add    %rdx,%rax
  movzbl (%rax),%eax
  movsbl %al,%ecx
  mov    -0x30(%rbp),%rax
  mov    -0x5c(%rbp),%edx
  movslq %edx,%rdx
  mov    %ecx,(%rax,%rdx,4)
  addl   $0x1,-0x5c(%rbp)
L83:
  mov    -0x5c(%rbp),%eax
  cmp    -0x4c(%rbp),%eax
  jl     L174
  movl   $0x0,-0x5c(%rbp)
  movl   $0x0,-0x58(%rbp)
  mov    -0x6c(%rbp),%eax
  mov    %eax,-0x54(%rbp)
  jmp    L163
L8:
  mov    -0x40(%rbp),%rax
  mov    -0x5c(%rbp),%edx
  movslq %edx,%rdx
  mov    (%rax,%rdx,4),%ecx
  mov    -0x30(%rbp),%rax
  mov    -0x58(%rbp),%edx
  movslq %edx,%rdx
  mov    (%rax,%rdx,4),%eax
  cmp    %eax,%ecx
  jge    L110
  mov    -0x40(%rbp),%rax
  mov    -0x5c(%rbp),%edx
  movslq %edx,%rdx
  mov    (%rax,%rdx,4),%edx
  mov    -0x54(%rbp),%eax
  movslq %eax,%rcx
  mov    -0x68(%rbp),%rax
  add    %rcx,%rax
  mov    %dl,(%rax)
  addl   $0x1,-0x54(%rbp)
  addl   $0x1,-0x5c(%rbp)
  jmp    L163
L110:
  mov    -0x30(%rbp),%rax
  mov    -0x58(%rbp),%edx
  movslq %edx,%rdx
  mov    (%rax,%rdx,4),%edx
  mov    -0x54(%rbp),%eax
  movslq %eax,%rcx
  mov    -0x68(%rbp),%rax
  add    %rcx,%rax
  mov    %dl,(%rax)
  addl   $0x1,-0x54(%rbp)
  addl   $0x1,-0x58(%rbp)
L163:
  mov    -0x5c(%rbp),%eax
  cmp    -0x50(%rbp),%eax
  jge    L141
  mov    -0x58(%rbp),%eax
  cmp    -0x4c(%rbp),%eax
  jl     L8
  jmp    L141
L157:
  mov    -0x40(%rbp),%rax
  mov    -0x5c(%rbp),%edx
  movslq %edx,%rdx
  mov    (%rax,%rdx,4),%edx
  mov    -0x54(%rbp),%eax
  movslq %eax,%rcx
  mov    -0x68(%rbp),%rax
  add    %rcx,%rax
  mov    %dl,(%rax)
  addl   $0x1,-0x54(%rbp)
  addl   $0x1,-0x5c(%rbp)
L141:
  mov    -0x5c(%rbp),%eax
  cmp    -0x50(%rbp),%eax
  jl     L157
  jmp    L153
L56:
  mov    -0x30(%rbp),%rax
  mov    -0x58(%rbp),%edx
  movslq %edx,%rdx
  mov    (%rax,%rdx,4),%edx
  mov    -0x54(%rbp),%eax
  movslq %eax,%rcx
  mov    -0x68(%rbp),%rax
  add    %rcx,%rax
  mov    %dl,(%rax)
  addl   $0x1,-0x54(%rbp)
  addl   $0x1,-0x58(%rbp)
L153:
  mov    -0x58(%rbp),%eax
  cmp    -0x4c(%rbp),%eax
  jl     L56
  mov    %rsi,%rsp
  nop
  mov    -0x28(%rbp),%rax
  sub    %fs:0x28,%rax
  je     L73
  call   <__stack_chk_fail@plt>
L73:
  lea    -0x20(%rbp),%rsp
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  pop    %rbp
  ret
```

assistant: ```c
void merge(char *str, int start, int mid, int high) {
  int n1 = mid - start + 1;
  int n2 = high - mid;
  int L[n1], R[n2];
  int i, j, k;
  for (i = 0; i < n1; i++) {
    L[i] = str[start + i];
  }
  for (i = 0; i < n2; i++) {
    R[i] = str[mid + i + 1];
  }
  i = 0, j = 0, k = start;
  while (i < n1 && j < n2) {
    if (L[i] < R[j]) {
      str[k] = L[i];
      k++;
      i++;
    } else {
      str[k] = R[j];
      k++;
      j++;
    }
  }
  while (i < n1) {
    str[k] = L[i];
    k++;
    i++;
  }
  while (j < n2) {
    str[k] = R[j];
    k++;
    j++;
  }
}
```