You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: commd.go
    path of file: ./repos/lotus/storage/sealer/commitment
    
    the code of the file until where you have to start completion: package commitment

import (
	"io"
	"os"
	"path/filepath"
)

const treeDFile = "sc-02-data-tree-d.dat"

// TreeDCommD reads CommD from tree-d
func TreeDCommD(cache string) ([32]byte, erro
    
func TreeDCommD(cache string) ([32]byte, error) {
	// Open the tree-d file for reading
	file, err := os.Open(filepath.Join(cache, treeDFile))
	if err != nil {
		return [32]byte{}, err
	}
	defer file.Close() // nolint:errcheck

	// Seek to 32 bytes from the end of the file
	_, err = file.Seek(-32, io.SeekEnd)
	if err != nil {
		return [32]byte{}, err
	}

	// Read the last 32 bytes
	var commD [32]byte
	_, err = file.Read(commD[:])
	if err != nil {
		return [32]byte{}, err
	}

	return commD, nil
}