这是我的代码和终端窗口。我应该怎么做才能使其正常工作并返回功能说明?
// Copyright DOCUMENTATION FOR ME. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package testDoc
// sayHello return "Hello world string"
func sayHello() string{
return "Hello world!"
}