user: What would the C source look like for the assembly code provided here:

```asm
<mergeKLists0>:
  endbr64
  push   %rbp
  mov    %rsp,%rbp
  push   %rbx
  sub    $0x48,%rsp
  mov    %rdi,-0x48(%rbp)
  mov    %esi,-0x4c(%rbp)
  cmpl   $0x0,-0x4c(%rbp)
  jne    L56
  mov    $0x0,%eax
  jmp    L47
L56:
  mov    -0x4c(%rbp),%eax
  cltq
  shl    $0x3,%eax
  mov    %eax,%edi
  call   <malloc@plt>
  mov    %rax,-0x28(%rbp)
  mov    -0x4c(%rbp),%eax
  cltq
  shl    $0x3,%eax
  mov    %eax,%edi
  call   <malloc@plt>
  mov    %rax,-0x20(%rbp)
  movl   $0xffffffff,-0x34(%rbp)
  movl   $0xffffffff,-0x30(%rbp)
  movl   $0x0,-0x2c(%rbp)
  jmp    L39
L31:
  mov    -0x2c(%rbp),%eax
  cltq
  lea    0x0(,%rax,8),%rdx
  mov    -0x48(%rbp),%rax
  add    %rdx,%rax
  addl   $0x1,-0x34(%rbp)
  mov    -0x34(%rbp),%edx
  movslq %edx,%rdx
  lea    0x0(,%rdx,8),%rcx
  mov    -0x28(%rbp),%rdx
  add    %rcx,%rdx
  mov    (%rax),%rax
  mov    %rax,(%rdx)
  addl   $0x1,-0x2c(%rbp)
L39:
  mov    -0x2c(%rbp),%eax
  cmp    -0x4c(%rbp),%eax
  jl     L31
  jmp    L73
L30:
  cmpl   $0x0,-0x34(%rbp)
  jle    L9
  mov    -0x34(%rbp),%eax
  lea    -0x1(%rax),%edx
  mov    %edx,-0x34(%rbp)
  cltq
  lea    0x0(,%rax,8),%rdx
  mov    -0x28(%rbp),%rax
  add    %rdx,%rax
  mov    (%rax),%rdx
  mov    -0x34(%rbp),%eax
  lea    -0x1(%rax),%ecx
  mov    %ecx,-0x34(%rbp)
  cltq
  lea    0x0(,%rax,8),%rcx
  mov    -0x28(%rbp),%rax
  add    %rcx,%rax
  mov    (%rax),%rax
  addl   $0x1,-0x30(%rbp)
  mov    -0x30(%rbp),%ecx
  movslq %ecx,%rcx
  lea    0x0(,%rcx,8),%rsi
  mov    -0x20(%rbp),%rcx
  lea    (%rsi,%rcx,1),%rbx
  mov    %rdx,%rsi
  mov    %rax,%rdi
  call   <merge@plt>
  mov    %rax,(%rbx)
  jmp    L43
L9:
  mov    -0x34(%rbp),%eax
  lea    -0x1(%rax),%edx
  mov    %edx,-0x34(%rbp)
  cltq
  lea    0x0(,%rax,8),%rdx
  mov    -0x28(%rbp),%rax
  add    %rdx,%rax
  addl   $0x1,-0x30(%rbp)
  mov    -0x30(%rbp),%edx
  movslq %edx,%rdx
  lea    0x0(,%rdx,8),%rcx
  mov    -0x20(%rbp),%rdx
  add    %rcx,%rdx
  mov    (%rax),%rax
  mov    %rax,(%rdx)
L43:
  cmpl   $0x0,-0x34(%rbp)
  jns    L30
  mov    -0x30(%rbp),%eax
  mov    %eax,-0x34(%rbp)
  movl   $0xffffffff,-0x30(%rbp)
  mov    -0x28(%rbp),%rax
  mov    %rax,-0x18(%rbp)
  mov    -0x20(%rbp),%rax
  mov    %rax,-0x28(%rbp)
  mov    -0x18(%rbp),%rax
  mov    %rax,-0x20(%rbp)
L73:
  cmpl   $0x0,-0x34(%rbp)
  jg     L43
  mov    -0x34(%rbp),%eax
  cltq
  lea    0x0(,%rax,8),%rdx
  mov    -0x28(%rbp),%rax
  add    %rdx,%rax
  mov    (%rax),%rax
L47:
  mov    -0x8(%rbp),%rbx
  leave
  ret
```

assistant: ```c
struct ListNode *mergeKLists0(struct ListNode **lists, int listsSize) {
  if (listsSize == 0)
    return NULL;
  struct ListNode **stack0 = (struct ListNode **)malloc(sizeof(struct ListNode *) * listsSize);
  struct ListNode **stack1 = (struct ListNode **)malloc(sizeof(struct ListNode *) * listsSize);
  int top0 = -1, top1 = -1;
  for (int i = 0; i < listsSize; i++)
    stack0[++top0] = lists[i];
  while (top0 > 0) {
    while (top0 > -1) {
      if (top0 > 0)
        stack1[++top1] = merge(stack0[top0--], stack0[top0--]);
      else
        stack1[++top1] = stack0[top0--];
    }
    top0 = top1;
    top1 = -1;
    struct ListNode **tmp = stack0;
    stack0 = stack1;
    stack1 = tmp;
  }
  return stack0[top0];
}
```