### Define and Instantiate Struct with ExConstructor

Source: https://github.com/appcues/exconstructor/blob/main/README.md

Define a struct using `defstruct` and then use `use ExConstructor` to automatically generate a `new` function for instantiation. This function handles various input data formats.

```elixir
defmodule TestStruct do
  use ExConstructor
  defstruct field_one: nil,
            field_two: nil,
            field_three: nil,
            field_four: nil
end

TestStruct.new(%{"field_one" => "a", "fieldTwo" => "b", :field_three => "c", :FieldFour => "d"})
# => %TestStruct{field_one: "a", field_two: "b", field_three: "c", field_four: "d"}
```

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