Need sub.go codes about gostart

[alco]

@wuzzdingbatch Could you provide more info? I'm not familiar with sub.go.

[wuzzdingbatch]

I learnt go from this page and it helps me a lot. But to explain dependency from other module/file like sub.go, I feel something missing with it. The main.go 'suddenly' calls a method from sub.go and there is no explanation how it was coded on sub.go to have its functions exported. I think the best way is to put the sub.go right after main.go so that the new learners like me can somehow knows how it works. Thanks