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: osname_go115.go
    path of file: ./repos/ko/vendor/github.com/aws/aws-sdk-go-v2/aws/middleware
    
    the code of the file until where you have to start completion: //go:build !go1.16
// +build !go1.16

package middleware

import "runtime"

func getNormalizedOSName() (os string) {
	switch runtime.GOOS {
	case "android":
		os = "android"
	cas
    
func getNormalizedOSName() (os string) {
	switch runtime.GOOS {
	case "android":
		os = "android"
	case "linux":
		os = "linux"
	case "windows":
		os = "windows"
	case "darwin":
		// Due to Apple M1 we can't distinguish between macOS and iOS when GOOS/GOARCH is darwin/amd64
		// For now declare this as "other" until we have a better detection mechanism.
		fallthrough
	default:
		os = "other"
	}
	return os
}