using libraries in Golang - go

Question

First of all and to be clear I come from the Java world, and I have been programming on go for a while and I really love it.
I have a small question about the packaging system and the imports, if I am importing a library which uses another library and I am already using that library in my project, how can I eliminate the duplication(if its possible),
in other words:
A is a the main program, C and B are libraries, and then:
C was added to A
B uses C
and then
B was also added to A
AProject/
src/
LibC/
src/
somefiles.go
LibB/
src/
LibC
somefiles.go
app.go
So now I have two libraries of C one in A since the beginning and one in B because B is dependent on C.
I know its a little bit confusing but in the Java world we have Ant and Maven and those build tools make it really easy to us to handle the dependencies.
Any thoughts?

Answer 1

In Go, there is no duplication of packages.
First, you should read about Go workspaces in How to Write Go Code.
From your question, your directory structure should look something like this:
gopath (gopath is the path of a directory in your $GOPATH list)
├── bin
│   └── projecta
├── pkg
│   └── linux_amd64
│   └── projecta
│   ├── libb.a
│   └── libc.a
└── src
└── projecta
   ├── a.go
   ├── libb
   │   └── b.go
   └── libc
   └── c.go
Where,
gopath/src/projecta/a.go:
package main
import (
"projecta/libb"
"projecta/libc"
)
func a() {
libb.B()
libc.C()
}
func main() { a() }
gopath/src/projecta/libb/b.go:
package libb
import (
"projecta/libc"
)
func B() { libc.C() }
gopath/src/projecta/libc/c.go:
package libc
func C() {}

Answer 2

If you are talking about third-party libraries, in go is very simple to do that,
just put the import in your source code, like:
import "github.com/somepackage/somelib"
and from the command line in your working directory run:
go get
the the source code of the libraries will be downloaded in the src directory of your $GOPATH.
If you want to create your own lib instead, just create the folder named as the lib in $GOPATH/src and put the code in this folder.
The folders structure is:
$GOPATH/
src/
github.com/
somepackage/
somelib/
somelib.go
yourlibB/
yourlibB.go -> //import somelib here
yourlibC/
yourlibC.go -> //import libB here
yourmainprogramA/
yourmainprogramA.go -> //import somelib, libC and libB here