Timelock, erc20Wrapper and erc20FlashMint verification

certora/helpers/DummyERC20Impl.sol

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+// SPDX-License-Identifier: agpl-3.0
+pragma solidity ^0.8.0;
+
+// with mint
+contract DummyERC20Impl {
+    uint256 t;
+    mapping (address => uint256) b;
+    mapping (address => mapping (address => uint256)) a;
+
+    string public name;
+    string public symbol;
+    uint public decimals;
+
+    function myAddress() public returns (address) {
+        return address(this);
+    }
+
+    function add(uint a, uint b) internal pure returns (uint256) {
+        uint c = a +b;
+        require (c >= a);
+        return c;
+    }
+    function sub(uint a, uint b) internal pure returns (uint256) {
+        require (a>=b);
+        return a-b;
+    }
+
+    function totalSupply() external view returns (uint256) {
+        return t;
+    }
+    function balanceOf(address account) external view returns (uint256) {
+        return b[account];
+    }
+    function transfer(address recipient, uint256 amount) external returns (bool) {
+        b[msg.sender] = sub(b[msg.sender], amount);
+        b[recipient] = add(b[recipient], amount);
+        return true;
+    }
+    function allowance(address owner, address spender) external view returns (uint256) {
+        return a[owner][spender];
+    }
+    function approve(address spender, uint256 amount) external returns (bool) {
+        a[msg.sender][spender] = amount;
+        return true;
+    }
+
+    function transferFrom(
+        address sender,
+        address recipient,
+        uint256 amount
+    ) external returns (bool) {
+        b[sender] = sub(b[sender], amount);
+        b[recipient] = add(b[recipient], amount);
+        a[sender][msg.sender] = sub(a[sender][msg.sender], amount);
+        return true;
+    }
+}