user: Demonstrate the C code that generates the assembly output below:

```asm
<merge_sort>:
  endbr64
  push   %r15
  push   %r14
  push   %r13
  push   %r12
  push   %rbp
  push   %rbx
  sub    $0x38,%rsp
  mov    %rdi,0x18(%rsp)
  mov    %rdx,0x20(%rsp)
  cmp    $0x1,%esi
  jle    L90
  mov    %esi,%ebx
  mov    %esi,%r14d
  mov    %rdi,%rbp
  sar    %ebx
  lea    0x0(,%rbx,8),%r13d
  sub    %ebx,%r14d
  mov    %ebx,0x28(%rsp)
  mov    %r13d,%edi
  lea    0x0(,%r14,8),%r15d
  mov    %r14d,0x2c(%rsp)
  call   <malloc@plt>
  mov    %r15d,%edi
  mov    %rax,%r12
  call   <malloc@plt>
  mov    %rbp,%rsi
  mov    %r13d,%edx
  mov    %r12,%rdi
  mov    %rax,0x10(%rsp)
  call   <memcpy@plt>
  movslq %ebx,%rax
  mov    %r15d,%edx
  lea    0x0(%rbp,%rax,8),%rsi
  mov    0x10(%rsp),%rbp
  mov    %rbp,%rdi
  call   <memcpy@plt>
  mov    0x20(%rsp),%r15
  mov    %ebx,%esi
  mov    %r12,%rdi
  mov    %r15,%rdx
  call   <merge_sort>
  mov    %r15,%rdx
  mov    %r14d,%esi
  mov    %rbp,%rdi
  call   <merge_sort>
  test   %r14d,%r14d
  jle    L39
  movq   $0x0,(%rsp)
  mov    $0x1,%r15d
  xor    %r13d,%r13d
  xor    %ebx,%ebx
  movq   $0x0,0x8(%rsp)
  xchg   %ax,%ax
L123:
  mov    0x10(%rsp),%rax
  mov    (%rsp),%rcx
  lea    (%rax,%rcx,8),%rbp
  mov    0x8(%rsp),%rax
  mov    0x0(%rbp),%rsi
  lea    (%r12,%rax,8),%r14
  mov    0x20(%rsp),%rax
  mov    (%r14),%rdi
  call   *%rax
  movslq %r15d,%rsi
  test   %eax,%eax
  jle    L53
  mov    0x0(%rbp),%rax
  mov    0x18(%rsp),%rdx
  add    $0x1,%r13d
  mov    %rax,-0x8(%rdx,%r15,8)
  add    $0x1,%r15
  cmp    %ebx,0x28(%rsp)
  jle    L14
  cmp    %r13d,0x2c(%rsp)
  jle    L110
  movslq %r13d,%rax
  mov    %rax,(%rsp)
  jmp    L123
  nopw   0x0(%rax,%rax,1)
L53:
  mov    (%r14),%rax
  mov    0x18(%rsp),%rcx
  add    $0x1,%ebx
  mov    %rax,-0x8(%rcx,%r15,8)
  add    $0x1,%r15
  cmp    %ebx,0x28(%rsp)
  jle    L14
  cmp    %r13d,0x2c(%rsp)
  jle    L110
  movslq %ebx,%rax
  mov    %rax,0x8(%rsp)
  jmp    L123
  xchg   %ax,%ax
L90:
  add    $0x38,%rsp
  pop    %rbx
  pop    %rbp
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  ret
  nop
L110:
  mov    0x28(%rsp),%eax
  cmp    %ebx,%eax
  jg     L82
  nopl   0x0(%rax,%rax,1)
L14:
  cmp    %r13d,0x2c(%rsp)
  jle    L23
  mov    0x10(%rsp),%rax
  mov    0x2c(%rsp),%edx
  movslq %r13d,%rcx
  lea    (%rax,%rcx,8),%r8
  mov    0x18(%rsp),%rax
  sub    %r13d,%edx
  shl    $0x3,%edx
  lea    (%rax,%rsi,8),%rdi
  mov    %r8,%rsi
  call   <memcpy@plt>
L23:
  mov    %r12,%rdi
  call   <free@plt>
  mov    0x10(%rsp),%rdi
  add    $0x38,%rsp
  pop    %rbx
  pop    %rbp
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  jmp    1070 <free@plt>
  xchg   %ax,%ax
L82:
  sub    %ebx,%eax
  movslq %ebx,%r9
  mov    %eax,%r13d
  mov    0x18(%rsp),%rax
  lea    (%r12,%r9,8),%r8
  shl    $0x3,%r13d
  lea    (%rax,%rsi,8),%rax
  mov    %rax,0x18(%rsp)
L52:
  mov    0x18(%rsp),%rdi
  mov    %r13d,%edx
  mov    %r8,%rsi
  call   <memcpy@plt>
  jmp    L23
L39:
  mov    %r12,%r8
  jmp    L52
```

assistant: ```c
void merge_sort(char **strArr, int len, int (*compar)(const char *, const char *)) {
  if (len <= 1)
    return;
  int leftLen = len / 2;
  int rightLen = len - leftLen;
  char **strArrLeft = malloc(leftLen * sizeof(const char *));
  char **strArrRight = malloc(rightLen * sizeof(const char *));
  memcpy(strArrLeft, &strArr[0], leftLen * sizeof(const char *));
  memcpy(strArrRight, &strArr[leftLen], rightLen * sizeof(const char *));
  merge_sort(strArrLeft, leftLen, compar);
  merge_sort(strArrRight, rightLen, compar);
  int writeInd = 0;
  int leftInd = 0;
  int rightInd = 0;
  while (leftInd < leftLen && rightInd < rightLen) {
    int cmp = compar(strArrLeft[leftInd], strArrRight[rightInd]);
    if (cmp <= 0) {
      strArr[writeInd++] = strArrLeft[leftInd++];
    } else {
      strArr[writeInd++] = strArrRight[rightInd++];
    }
  }
  if (leftInd < leftLen) {
    memcpy(&strArr[writeInd], &strArrLeft[leftInd], (leftLen - leftInd) * sizeof(const char *));
  } else if (rightInd < rightLen) {
    memcpy(&strArr[writeInd], &strArrRight[rightInd], (rightLen - rightInd) * sizeof(const char *));
  }
  free(strArrLeft);
  free(strArrRight);
}
```