如何将包装中存在的文件读取到属于同一包装的另一个文件中？

I'm trying to a read a file (a.go) present in a package into another file (b.go) which is also present in the same package. I used os.Open() method but it is working only when i give the complete system path of the file(ex: home/bin/xyz/a.go).

But, I want the file (a.go) to be read into (b.go) without using the entire system path. Can anyone please help?

Folder

  -- a.go

  -- b.go

//Inside b.go we have a function//

func (xyz){

x:= os.Open("--path to a.go--") // This path shouldn't be the system path

}

You can get the path of the current file by using this technique.

_, srcpath, _, _ := runtime.Caller(0)
dirpath := filepath.Dir(srcpath)
err, fp := os.Open(filepath.Join(dirpath, "a.go"))
if err != nil {
     // err
}
...
fp.Close()