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## Lineup
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For this to be a good festival, you need to register artists. Hip hip hip, arrays!
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### Instructions
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- Create a new Smart Contract `Lineup`.
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- Create a function `addArtist(string)` that takes as parameter a string. Artists are added in their order of registration.
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- Create a function`lineup(uint)` that given an index returns the name of corresponding artist.
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### Hint
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Public variables offer an implicit getter function
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### Notions
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- [solidity docs: arrays](https://docs.soliditylang.org/en/v0.8.4/types.html#arrays)
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