//SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

contract ConnectingWorldCapitalToken {

    string public constant name = "Connecting World Capital Token";
    string public constant symbol = "CWCX";
    uint8 public constant decimals = 6;


    event Approval(address indexed tokenOwner, address indexed spender, uint tokens);
    event Transfer(address indexed from, address indexed to, uint tokens);


    mapping(address => uint256) balances;

    mapping(address => mapping(address => uint256)) allowed;

    uint256 totalSupply_;

    using SafeMath for uint256;


    constructor() {
        totalSupply_ = 20000000 * 10 ** 6;
        balances[msg.sender] = totalSupply_;
    }

    function totalSupply() public view returns(uint256) {
        return totalSupply_;
    }

    function balanceOf(address tokenOwner) public view returns(uint) {
        return balances[tokenOwner];
    }

    function transfer(address receiver, uint numTokens) public returns(bool) {
        require(numTokens <= balances[msg.sender]);
        balances[msg.sender] = balances[msg.sender].sub(numTokens);
        balances[receiver] = balances[receiver].add(numTokens);
        emit Transfer(msg.sender, receiver, numTokens);
        return true;
    }

    function approve(address delegate, uint numTokens) public returns(bool) {
        allowed[msg.sender][delegate] = numTokens;
        emit Approval(msg.sender, delegate, numTokens);
        return true;
    }

    function allowance(address owner, address delegate) public view returns(uint) {
        return allowed[owner][delegate];
    }

    function transferFrom(address owner, address buyer, uint numTokens) public returns(bool) {
        require(numTokens <= balances[owner]);
        require(numTokens <= allowed[owner][msg.sender]);

        balances[owner] = balances[owner].sub(numTokens);
        allowed[owner][msg.sender] = allowed[owner][msg.sender].sub(numTokens);
        balances[buyer] = balances[buyer].add(numTokens);
        emit Transfer(owner, buyer, numTokens);
        return true;
    }
}

library SafeMath {
    function sub(uint256 a, uint256 b) internal pure returns(uint256) {
        assert(b <= a);
        return a - b;
    }

    function add(uint256 a, uint256 b) internal pure returns(uint256) {
        uint256 c = a + b;
        assert(c >= a);
        return c;
    }
}