Iterator Design Pattern

Instructions in the code at //TODO comments.

To run : go run *.go

Example of expected output :

User is &{name:a age:30}
User is &{name:b age:20}

Name		Name	Last commit message	Last commit date
Latest commit History 3 Commits
README.md		README.md
collection.go		collection.go
iterator.go		iterator.go
main.go		main.go
user.go		user.go
userCollection.go		userCollection.go
userIterator.go		userIterator.go

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