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9mapping(address => bool) public wallets;
10
11/// @notice events of approval and revoking wallets
12event ApproveWallet(address);
13event RevokeWallet(address);
14
15constructor() {}
16
17/// @notice approves wallet
18/// @param _wallet the wallet to approve
19function approveWallet(address _wallet) external onlyOwner {
20    wallets[_wallet] = true;
21
22    emit ApproveWallet(_wallet);
23}
24
25/// @notice revokes wallet
26/// @param _wallet the wallet to revoke
27function revokeWallet(address _wallet) external onlyOwner {
28    wallets[_wallet] = false;
29
30    emit RevokeWallet(_wallet);
31}
32
33/// @notice checks if _wallet is whitelisted
34/// @param _wallet the wallet to check
35/// @return true if wallet is whitelisted
36function check(address _wallet) external view returns (bool) {
37    return wallets[_wallet];
38}

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15constructor() {}