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

```asm
<foo>:
  endbr64
  push   %rbp
  mov    %rsp,%rbp
  mov    %rdi,-0x28(%rbp)
  mov    %rsi,-0x30(%rbp)
  mov    %edx,-0x34(%rbp)
  mov    -0x28(%rbp),%rax
  movzwl %ax,%eax
  mov    %rax,-0x10(%rbp)
  mov    -0x28(%rbp),%rax
  shr    $0x10,%rax
  and    $0xffff,%eax
  mov    %rax,-0x8(%rbp)
  cmpq   $0x0,-0x30(%rbp)
  jne    L68
  mov    $0x1,%eax
  jmp    L9
L10:
  mov    -0x34(%rbp),%eax
  mov    $0x15b0,%edx
  cmp    %edx,%eax
  cmova  %edx,%eax
  mov    %eax,-0x14(%rbp)
  mov    -0x14(%rbp),%eax
  sub    %eax,-0x34(%rbp)
  jmp    L4
L31:
  mov    -0x30(%rbp),%rax
  lea    0x1(%rax),%rdx
  mov    %rdx,-0x30(%rbp)
  movzbl (%rax),%eax
  movzbl %al,%eax
  add    %rax,-0x10(%rbp)
  mov    -0x10(%rbp),%rax
  add    %rax,-0x8(%rbp)
  mov    -0x30(%rbp),%rax
  lea    0x1(%rax),%rdx
  mov    %rdx,-0x30(%rbp)
  movzbl (%rax),%eax
  movzbl %al,%eax
  add    %rax,-0x10(%rbp)
  mov    -0x10(%rbp),%rax
  add    %rax,-0x8(%rbp)
  mov    -0x30(%rbp),%rax
  lea    0x1(%rax),%rdx
  mov    %rdx,-0x30(%rbp)
  movzbl (%rax),%eax
  movzbl %al,%eax
  add    %rax,-0x10(%rbp)
  mov    -0x10(%rbp),%rax
  add    %rax,-0x8(%rbp)
  mov    -0x30(%rbp),%rax
  lea    0x1(%rax),%rdx
  mov    %rdx,-0x30(%rbp)
  movzbl (%rax),%eax
  movzbl %al,%eax
  add    %rax,-0x10(%rbp)
  mov    -0x10(%rbp),%rax
  add    %rax,-0x8(%rbp)
  mov    -0x30(%rbp),%rax
  lea    0x1(%rax),%rdx
  mov    %rdx,-0x30(%rbp)
  movzbl (%rax),%eax
  movzbl %al,%eax
  add    %rax,-0x10(%rbp)
  mov    -0x10(%rbp),%rax
  add    %rax,-0x8(%rbp)
  mov    -0x30(%rbp),%rax
  lea    0x1(%rax),%rdx
  mov    %rdx,-0x30(%rbp)
  movzbl (%rax),%eax
  movzbl %al,%eax
  add    %rax,-0x10(%rbp)
  mov    -0x10(%rbp),%rax
  add    %rax,-0x8(%rbp)
  mov    -0x30(%rbp),%rax
  lea    0x1(%rax),%rdx
  mov    %rdx,-0x30(%rbp)
  movzbl (%rax),%eax
  movzbl %al,%eax
  add    %rax,-0x10(%rbp)
  mov    -0x10(%rbp),%rax
  add    %rax,-0x8(%rbp)
  mov    -0x30(%rbp),%rax
  lea    0x1(%rax),%rdx
  mov    %rdx,-0x30(%rbp)
  movzbl (%rax),%eax
  movzbl %al,%eax
  add    %rax,-0x10(%rbp)
  mov    -0x10(%rbp),%rax
  add    %rax,-0x8(%rbp)
  mov    -0x30(%rbp),%rax
  lea    0x1(%rax),%rdx
  mov    %rdx,-0x30(%rbp)
  movzbl (%rax),%eax
  movzbl %al,%eax
  add    %rax,-0x10(%rbp)
  mov    -0x10(%rbp),%rax
  add    %rax,-0x8(%rbp)
  mov    -0x30(%rbp),%rax
  lea    0x1(%rax),%rdx
  mov    %rdx,-0x30(%rbp)
  movzbl (%rax),%eax
  movzbl %al,%eax
  add    %rax,-0x10(%rbp)
  mov    -0x10(%rbp),%rax
  add    %rax,-0x8(%rbp)
  mov    -0x30(%rbp),%rax
  lea    0x1(%rax),%rdx
  mov    %rdx,-0x30(%rbp)
  movzbl (%rax),%eax
  movzbl %al,%eax
  add    %rax,-0x10(%rbp)
  mov    -0x10(%rbp),%rax
  add    %rax,-0x8(%rbp)
  mov    -0x30(%rbp),%rax
  lea    0x1(%rax),%rdx
  mov    %rdx,-0x30(%rbp)
  movzbl (%rax),%eax
  movzbl %al,%eax
  add    %rax,-0x10(%rbp)
  mov    -0x10(%rbp),%rax
  add    %rax,-0x8(%rbp)
  mov    -0x30(%rbp),%rax
  lea    0x1(%rax),%rdx
  mov    %rdx,-0x30(%rbp)
  movzbl (%rax),%eax
  movzbl %al,%eax
  add    %rax,-0x10(%rbp)
  mov    -0x10(%rbp),%rax
  add    %rax,-0x8(%rbp)
  mov    -0x30(%rbp),%rax
  lea    0x1(%rax),%rdx
  mov    %rdx,-0x30(%rbp)
  movzbl (%rax),%eax
  movzbl %al,%eax
  add    %rax,-0x10(%rbp)
  mov    -0x10(%rbp),%rax
  add    %rax,-0x8(%rbp)
  mov    -0x30(%rbp),%rax
  lea    0x1(%rax),%rdx
  mov    %rdx,-0x30(%rbp)
  movzbl (%rax),%eax
  movzbl %al,%eax
  add    %rax,-0x10(%rbp)
  mov    -0x10(%rbp),%rax
  add    %rax,-0x8(%rbp)
  mov    -0x30(%rbp),%rax
  lea    0x1(%rax),%rdx
  mov    %rdx,-0x30(%rbp)
  movzbl (%rax),%eax
  movzbl %al,%eax
  add    %rax,-0x10(%rbp)
  mov    -0x10(%rbp),%rax
  add    %rax,-0x8(%rbp)
  subl   $0x10,-0x14(%rbp)
L4:
  cmpl   $0xf,-0x14(%rbp)
  jg     L31
  cmpl   $0x0,-0x14(%rbp)
  je     L21
L40:
  mov    -0x30(%rbp),%rax
  lea    0x1(%rax),%rdx
  mov    %rdx,-0x30(%rbp)
  movzbl (%rax),%eax
  movzbl %al,%eax
  add    %rax,-0x10(%rbp)
  mov    -0x10(%rbp),%rax
  add    %rax,-0x8(%rbp)
  subl   $0x1,-0x14(%rbp)
  cmpl   $0x0,-0x14(%rbp)
  jne    L40
L21:
  mov    -0x10(%rbp),%rcx
  movabs $0xf00e10d2fc5cd,%rdx
  mov    %rcx,%rax
  mul    %rdx
  mov    %rcx,%rax
  sub    %rdx,%rax
  shr    %rax
  add    %rdx,%rax
  shr    $0xf,%rax
  imul   $0xfff1,%rax,%rdx
  mov    %rcx,%rax
  sub    %rdx,%rax
  mov    %rax,-0x10(%rbp)
  mov    -0x8(%rbp),%rcx
  movabs $0xf00e10d2fc5cd,%rdx
  mov    %rcx,%rax
  mul    %rdx
  mov    %rcx,%rax
  sub    %rdx,%rax
  shr    %rax
  add    %rdx,%rax
  shr    $0xf,%rax
  imul   $0xfff1,%rax,%rdx
  mov    %rcx,%rax
  sub    %rdx,%rax
  mov    %rax,-0x8(%rbp)
L68:
  cmpl   $0x0,-0x34(%rbp)
  jne    L10
  mov    -0x8(%rbp),%rax
  shl    $0x10,%rax
  or     -0x10(%rbp),%rax
L9:
  pop    %rbp
  ret
```

assistant: ```c
unsigned long foo(unsigned long x, unsigned char *y, unsigned int z) {
  unsigned long a = x & 0xffff;
  unsigned long b = (x >> 16) & 0xffff;
  int k;
  if (y == 0)
    return 1L;
  while (z > 0) {
    k = z < 5552 ? z : 5552;
    z -= k;
    while (k >= 16) {
      a += *y++;
      b += a;
      a += *y++;
      b += a;
      a += *y++;
      b += a;
      a += *y++;
      b += a;
      a += *y++;
      b += a;
      a += *y++;
      b += a;
      a += *y++;
      b += a;
      a += *y++;
      b += a;
      a += *y++;
      b += a;
      a += *y++;
      b += a;
      a += *y++;
      b += a;
      a += *y++;
      b += a;
      a += *y++;
      b += a;
      a += *y++;
      b += a;
      a += *y++;
      b += a;
      a += *y++;
      b += a;
      k -= 16;
    }
    if (k != 0)
      do {
        a += *y++;
        b += a;
      } while (--k);
    a %= 65521L;
    b %= 65521L;
  }
  return (b << 16) | a;
}
```