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Read about alias and import in the Getting Started guide.
Read about module composition on elixirschool.com.

1. Fix compilation error `Race.struct/0 is undefined`

An alias can be created with the alias special form.

2. Fix compilation error `Car.struct/0 is undefined`

An alias can be created with the alias special form.
The alias special form accepts an :as option.

3. Fix compilation error `undefined function puts/1`

Functions can be imported with the import special form.
The import special form accepts an :only option. Its value should be a keyword list with function name as keys and function arities as values.

4. Fix compilation error `undefined function default_color/0`

Functions can be imported with the import special form.
The import special form accepts an :except option. Its value should be a keyword list with function name as keys and function arities as values.