[G-01] Multiple address/ID mappings can be combined into a single mapping of an address/ID to a struct, where appropriate https://github.com/code-423n4/2023-07-lens/blob/4ad521f84c43771d365ec0b35f904158201943fb/contracts/FollowNFT.sol#L36C5-L36C6 https://github.com/code-423n4/2023-07-lens/blob/4ad521f84c43771d365ec0b35f904158201943fb/contracts/FollowNFT.sol#L37 https://github.com/code-423n4/2023-07-lens/blob/4ad521f84c43771d365ec0b35f904158201943fb/contracts/FollowNFT.sol#L38