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: example.go
    path of file: ./repos/eris/examples/logging
    
    the code of the file until where you have to start completion: package main

import (
	"fmt"
	"os"
	"path/filepath"

	"github.com/pkg/errors"
	"github.com/rotisserie/eris"
	"github.c
    
func getRelPath(base string, path string) (string, error) {
	relPath, err := filepath.Rel(base, path)
	if err != nil {
		// it's generally useful to wrap external errors with a type that you know how to handle
		// first (e.g. ErrInternalServer). this will help if/when you want to do error inspection
		// via eris.Is(err, ErrInternalServer) or eris.Cause(err).
		return "", eris.Wrap(errInternalServer, err.Error())
	}
	return relPath, nil
}