I've made each file in pkg folder , as main , to make it possible to run it independently, for example for checking closure , you can navigate to closure solder cd ./pkg/closure and execute there go run . to run code and see result. For making it possible to import into main root package we just can navigate to index.go file in pkg/closure folder and rename package on closure , and then in root main.go file import this package by import("golang/pkg/closure")

git clean -n -d -x - clean cached files

export PATH=$PATH:/usr/local/go/bin

go build -gcflags "-m -l" - check which parts of codes excape to the heap