Usage instructions are slightly defective (at README.md)

[mojtaba-eshghie]

Hi,

The extract code commands don't work:

(base) mojtabaeshghie@mojtabaeshghie-mbp teether % python bin/extract_contract_code.py test.code > test.contract.code
WARNING:root:No CODECOPY in this contract!!
Traceback (most recent call last):
  File "bin/extract_contract_code.py", line 48, in <module>
    contract = extract_contract_code(code)
  File "bin/extract_contract_code.py", line 18, in extract_contract_code
    p.cfg.trim()
  File "/Users/mojtabaeshghie/.pyenv/versions/3.8.13/lib/python3.8/site-packages/teether-0.1.10-py3.8.egg/teether/project.py", line 45, in cfg
  File "/Users/mojtabaeshghie/.pyenv/versions/3.8.13/lib/python3.8/site-packages/teether-0.1.10-py3.8.egg/teether/cfg/cfg.py", line 12, in __init__
KeyError: 0

My contract source is:

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

contract Test {
    struct Transaction {
        address to;
        uint amount;
    }

    mapping(bytes32 => Transaction) transactions;

    address owner;

    constructor() {
        owner = msg.sender;
    }

    function setOwner(address newOwner) public {
        owner = newOwner;
    }

    function newTransaction(address to, uint amount) public returns (bytes32) {
        bytes32 token = keccak256(abi.encodePacked(to, amount));
        Transaction storage t = transactions[token];
        t.to = to;
        t.amount += amount;
        return token;
    }

    function approve(bytes32 token) public {
        require(owner == msg.sender, "Only the owner can approve transactions");
        Transaction storage t = transactions[token];
        payable(t.to).transfer(t.amount);
        delete transactions[token];
    }

    // Fallback function to receive ether
    receive() external payable {}
}