starknet-cairo-101
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Imports and Nits
Moving PR comments to this issue.
Suggest CamelCase interface names as follows cairo-lang.org and OZ naming conventions.
Remove unused imports.
And import OZ utils from openzeppelin.token.erc20.library import ERC20
Can remove internal tempvar binding with return in the if block.
Nit: suggest removing _storage from variables annotated @storage_variable