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: map.go
    path of file: ./repos/kubeedge/vendor/github.com/imdario/mergo
    
    the code of the file until where you have to start completion: // Copyright 2014 Dario Castañé. All rights reserved.
// Copyright 2009 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

// Based on src/pkg/reflect/deepequal.go from official
// golang's stdlib.

package mergo

import (
	"fmt"
	"reflect"
	"unicode"
	"unicode/utf8"
)

func changeInitialCase(s string, mapper func(rune) rune) string {
	if s == "" {
		return s
	}
	r, n := utf8.DecodeRuneInString(s)
	return string(mapper(r)) + s[n:]
}

func isExported(field reflect.StructField) bool {
	r, _ := utf8.DecodeRuneInSt
    
func deepMap(dst, src reflect.Value, visited map[uintptr]*visit, depth int, config *Config) (err error) {
	overwrite := config.Overwrite
	if dst.CanAddr() {
		addr := dst.UnsafeAddr()
		h := 17 * addr
		seen := visited[h]
		typ := dst.Type()
		for p := seen; p != nil; p = p.next {
			if p.ptr == addr && p.typ == typ {
				return nil
			}
		}
		// Remember, remember...
		visited[h] = &visit{addr, typ, seen}
	}
	zeroValue := reflect.Value{}
	switch dst.Kind() {
	case reflect.Map:
		dstMap := dst.Interface().(map[string]interface{})
		for i, n := 0, src.NumField(); i < n; i++ {
			srcType := src.Type()
			field := srcType.Field(i)
			if !isExported(field) {
				continue
			}
			fieldName := field.Name
			fieldName = changeInitialCase(fieldName, unicode.ToLower)
			if v, ok := dstMap[fieldName]; !ok || (isEmptyValue(reflect.ValueOf(v)) || overwrite) {
				dstMap[fieldName] = src.Field(i).Interface()
			}
		}
	case reflect.Ptr:
		if dst.IsNil() {
			v := reflect.New(dst.Type().Elem())
			dst.Set(v)
		}
		dst = dst.Elem()
		fallthrough
	case reflect.Struct:
		srcMap := src.Interface().(map[string]interface{})
		for key := range srcMap {
			config.overwriteWithEmptyValue = true
			srcValue := srcMap[key]
			fieldName := changeInitialCase(key, unicode.ToUpper)
			dstElement := dst.FieldByName(fieldName)
			if dstElement == zeroValue {
				// We discard it because the field doesn't exist.
				continue
			}
			srcElement := reflect.ValueOf(srcValue)
			dstKind := dstElement.Kind()
			srcKind := srcElement.Kind()
			if srcKind == reflect.Ptr && dstKind != reflect.Ptr {
				srcElement = srcElement.Elem()
				srcKind = reflect.TypeOf(srcElement.Interface()).Kind()
			} else if dstKind == reflect.Ptr {
				// Can this work? I guess it can't.
				if srcKind != reflect.Ptr && srcElement.CanAddr() {
					srcPtr := srcElement.Addr()
					srcElement = reflect.ValueOf(srcPtr)
					srcKind = reflect.Ptr
				}
			}

			if !srcElement.IsValid() {
				continue
			}
			if srcKind == dstKind {
				if err = deepMerge(dstElement, srcElement, visited, depth+1, config); err != nil {
					return
				}
			} else if dstKind == reflect.Interface && dstElement.Kind() == reflect.Interface {
				if err = deepMerge(dstElement, srcElement, visited, depth+1, config); err != nil {
					return
				}
			} else if srcKind == reflect.Map {
				if err = deepMap(dstElement, srcElement, visited, depth+1, config); err != nil {
					return
				}
			} else {
				return fmt.Errorf("type mismatch on %s field: found %v, expected %v", fieldName, srcKind, dstKind)
			}
		}
	}
	return
}