How to turn maps and keyword lists into Elixir structs 

One nice way of turning a map or keyword list into an existing struct is to use
`struct/2` or `struct!/2`.
- `struct/2` will drop any attributes that are not part of the struct
- `struct!/2` will raise an error if there are attributes that are not part of
the struct
But not only can they create structs, they can also update them!
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