Inheritance Assignment Gaurav Sahoo

#1

pragma solidity 0.7.5;
import “./Ownable.sol”;
import “./Destroyable.sol”;

contract Bank is Ownable, Destroyable {

mapping(address => uint) balance;

event depositDone(uint amount, address indexed depositedTo);

function deposit() public payable returns (uint)  {
    balance[msg.sender] += msg.value;
    emit depositDone(msg.value, msg.sender);
    return balance[msg.sender];
}

function withdraw(uint amount) public onlyOwner returns (uint){
    require(balance[msg.sender] >= amount);
    msg.sender.transfer(amount);
    return balance[msg.sender];
}

function getBalance() public view returns (uint){
    return balance[msg.sender];
}

function transfer(address recipient, uint amount) public {
    require(balance[msg.sender] >= amount, "Balance not sufficient");
    require(msg.sender != recipient, "Don't transfer money to yourself");
    
    uint previousSenderBalance = balance[msg.sender];
    
    _transfer(msg.sender, recipient, amount);
    

    assert(balance[msg.sender] == previousSenderBalance - amount);
}

function _transfer(address from, address to, uint amount) private {
    balance[from] -= amount;
    balance[to] += amount;
}

}

contract Ownable {
address internal owner;

modifier onlyOwner {
    require(msg.sender == owner);
    _; //run the function
}

constructor(){
    owner = msg.sender;
}

}

import “./Ownable.sol”;
pragma solidity 0.7.5;

contract Destroyable is Ownable {

function destroy() public onlyOwner {
selfdestruct(msg.sender);
}
}

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