user: Please show me the C implementation that matches the assembly code listed below:

```asm
<merge>:
  endbr64
  push   %rbp
  mov    %rsp,%rbp
  sub    $0x70,%rsp
  mov    %rdi,-0x48(%rbp)
  mov    %rsi,-0x50(%rbp)
  mov    %rdx,-0x58(%rbp)
  mov    %rcx,-0x60(%rbp)
  mov    %r8,-0x68(%rbp)
  mov    -0x50(%rbp),%rax
  sub    -0x48(%rbp),%rax
  mov    %rax,%rdx
  mov    -0x60(%rbp),%rax
  add    %rdx,%rax
  mov    %rax,-0x28(%rbp)
  mov    -0x58(%rbp),%rax
  sub    -0x50(%rbp),%rax
  mov    %rax,%rdx
  mov    -0x60(%rbp),%rax
  add    %rdx,%rax
  mov    %rax,-0x20(%rbp)
  mov    -0x28(%rbp),%rdx
  mov    -0x60(%rbp),%rax
  add    %rdx,%rax
  mov    %rax,%rdi
  call   <malloc@plt>
  mov    %rax,-0x18(%rbp)
  mov    -0x20(%rbp),%rdx
  mov    -0x60(%rbp),%rax
  add    %rdx,%rax
  mov    %rax,%rdi
  call   <malloc@plt>
  mov    %rax,-0x10(%rbp)
  mov    -0x28(%rbp),%rdx
  mov    -0x48(%rbp),%rcx
  mov    -0x18(%rbp),%rax
  mov    %rcx,%rsi
  mov    %rax,%rdi
  call   <memcpy@plt>
  mov    -0x20(%rbp),%rdx
  mov    -0x50(%rbp),%rcx
  mov    -0x10(%rbp),%rax
  mov    %rcx,%rsi
  mov    %rax,%rdi
  call   <memcpy@plt>
  movl   $0x0,-0x34(%rbp)
  movl   $0x0,-0x30(%rbp)
  movl   $0x0,-0x2c(%rbp)
  mov    -0x48(%rbp),%rax
  mov    %rax,-0x8(%rbp)
  jmp    L47
L53:
  mov    -0x30(%rbp),%eax
  cltq
  imul   -0x60(%rbp),%rax
  mov    %rax,%rdx
  mov    -0x10(%rbp),%rax
  add    %rax,%rdx
  mov    -0x34(%rbp),%eax
  cltq
  imul   -0x60(%rbp),%rax
  mov    %rax,%rcx
  mov    -0x18(%rbp),%rax
  add    %rcx,%rax
  mov    %rdx,%rsi
  mov    %rax,%rdi
  call   <compare@plt>
  test   %rax,%rax
  jns    L26
  mov    -0x34(%rbp),%eax
  cltq
  imul   -0x60(%rbp),%rax
  mov    %rax,%rdx
  mov    -0x18(%rbp),%rax
  lea    (%rdx,%rax,1),%rsi
  mov    -0x2c(%rbp),%eax
  cltq
  imul   -0x60(%rbp),%rax
  mov    %rax,%rdx
  mov    -0x8(%rbp),%rax
  lea    (%rdx,%rax,1),%rcx
  mov    -0x60(%rbp),%rax
  mov    %rax,%rdx
  mov    %rcx,%rdi
  call   <memcpy@plt>
  addl   $0x1,-0x2c(%rbp)
  addl   $0x1,-0x34(%rbp)
  jmp    L47
L26:
  mov    -0x30(%rbp),%eax
  cltq
  imul   -0x60(%rbp),%rax
  mov    %rax,%rdx
  mov    -0x10(%rbp),%rax
  lea    (%rdx,%rax,1),%rsi
  mov    -0x2c(%rbp),%eax
  cltq
  imul   -0x60(%rbp),%rax
  mov    %rax,%rdx
  mov    -0x8(%rbp),%rax
  lea    (%rdx,%rax,1),%rcx
  mov    -0x60(%rbp),%rax
  mov    %rax,%rdx
  mov    %rcx,%rdi
  call   <memcpy@plt>
  addl   $0x1,-0x2c(%rbp)
  addl   $0x1,-0x30(%rbp)
L47:
  mov    -0x34(%rbp),%eax
  movslq %eax,%rcx
  mov    -0x28(%rbp),%rax
  mov    $0x0,%edx
  divq   -0x60(%rbp)
  cmp    %rax,%rcx
  jae    L64
  mov    -0x30(%rbp),%eax
  movslq %eax,%rcx
  mov    -0x20(%rbp),%rax
  mov    $0x0,%edx
  divq   -0x60(%rbp)
  cmp    %rax,%rcx
  jb     L53
L64:
  mov    -0x34(%rbp),%eax
  movslq %eax,%rcx
  mov    -0x28(%rbp),%rax
  mov    $0x0,%edx
  divq   -0x60(%rbp)
  cmp    %rax,%rcx
  jne    L49
  mov    -0x28(%rbp),%rdx
  mov    -0x20(%rbp),%rax
  add    %rax,%rdx
  mov    -0x2c(%rbp),%eax
  cltq
  imul   -0x60(%rbp),%rax
  sub    %rax,%rdx
  mov    -0x30(%rbp),%eax
  cltq
  imul   -0x60(%rbp),%rax
  mov    %rax,%rcx
  mov    -0x10(%rbp),%rax
  add    %rax,%rcx
  mov    -0x2c(%rbp),%eax
  cltq
  imul   -0x60(%rbp),%rax
  mov    %rax,%rsi
  mov    -0x8(%rbp),%rax
  add    %rsi,%rax
  mov    %rcx,%rsi
  mov    %rax,%rdi
  call   <memcpy@plt>
  jmp    L42
L49:
  mov    -0x20(%rbp),%rdx
  mov    -0x28(%rbp),%rax
  add    %rax,%rdx
  mov    -0x2c(%rbp),%eax
  cltq
  imul   -0x60(%rbp),%rax
  sub    %rax,%rdx
  mov    -0x34(%rbp),%eax
  cltq
  imul   -0x60(%rbp),%rax
  mov    %rax,%rcx
  mov    -0x18(%rbp),%rax
  add    %rax,%rcx
  mov    -0x2c(%rbp),%eax
  cltq
  imul   -0x60(%rbp),%rax
  mov    %rax,%rsi
  mov    -0x8(%rbp),%rax
  add    %rsi,%rax
  mov    %rcx,%rsi
  mov    %rax,%rdi
  call   <memcpy@plt>
L42:
  nop
  leave
  ret
```

assistant: ```c
void merge(void *low, void *mid, void *high, size_t width, int (*comp)(const void *, const void *)) {
  size_t nl = (char *)mid - (char *)low + width;
  size_t nr = (char *)high - (char *)mid + width;
  char *left = malloc(nl + width);
  char *right = malloc(nr + width);
  memcpy(left, low, nl);
  memcpy(right, mid, nr);
  int i = 0, j = 0, k = 0;
  char *clow = (char *)low;
  while (i < nl / width && j < nr / width) {
    if (compare(left + i * width, right + j * width) < 0) {
      memcpy(clow + k * width, left + i * width, width);
      ++k;
      ++i;
    } else {
      memcpy(clow + k * width, right + j * width, width);
      ++k;
      ++j;
    }
  }
  if (i == nl / width) {
    memcpy(clow + k * width, right + j * width, nl + nr - k * width);
  } else {
    memcpy(clow + k * width, left + i * width, nr + nl - k * width);
  }
}
```