Go Binary Installed Through "Go Install" command outputs nothing

Context:

This go tutorial on building and installing Go binaries is what I followed. Until this one, I believe I've correctly followed every tutorial that comes before.

Here's a look at the basic main package that I wrote that calls packages from then neighboring directories.

As instructed in that tutorial, I also added to the PATH variable, my go binary output path:

/home/exampleuser/go/bin

Again, as instructed, I cd'd to my go main package directory and ran the following commands:

$ go build
$ go install

And as said in the documentation this did put the binary in the $GOBIN path which again has been added to the path variable:

Expectation:

If ./caller is the binary, after installing it, from any directory I should get the response as obtained by running the .go file with go run:

$ caller

>> map[SysAdmin:Great to see you, SysAdmin! CloudBender:Hail CloudBender, well met! Engineer:Hail Engineer, well met!]

Actual Output:

$ caller

>> 

PS

I am not sure if all the environment variables seen on running the go env command, are supposed to be printed out when echoed like: echo $<GO ENV VARIABLE>. For example when I tried echoing $GOBIN, I get a blank output.

Thanks to this thread. As said there, I tried setting $GOPATH first and then referenced it in $PATH and also set $GOBIN. and implemented it all by sourcing ~/.bashrc.

Additionally, I changed my module name a bit and then built and installed it. And then it worked as expected.