contract EFFCOIN is ERC20Interface{
    string public name = "EFF COIN";
    string public symbol = "EFF";
    uint public decimals = 8;
    
    uint public supply;
    address public founder;
    
    mapping(address => uint) public balances;


 event Transfer(address indexed from, address indexed to, uint tokens);


    constructor() public{
        supply = 10000000000000000;
        founder = msg.sender;
        balances[founder] = supply;
    }
    
    
    function totalSupply() public view returns (uint){
        return supply;
    }
    
    function balanceOf(address tokenOwner) public view returns (uint balance){
         return balances[tokenOwner];
     }
     
     
    //transfer from the owner balance to another address
    function transfer(address to, uint tokens) public returns (bool success){
         require(balances[msg.sender] >= tokens && tokens > 0);
         
         balances[to] += tokens;
         balances[msg.sender] -= tokens;
         emit Transfer(msg.sender, to, tokens);
         return true;
     }
     
     
     function burn(uint256 _value) public returns (bool success) {
        require(balances[founder] >= _value);   // Check if the sender has enough
        balances[founder] -= _value;            // Subtract from the sender
        supply -= _value;                      // Updates totalSupply
        return true;
    }

    function mint(uint256 _value) public returns (bool success) {
        require(balances[founder] >= _value);   // Check if the sender has enough
        balances[founder] += _value;            // Add to the sender
        supply += _value;                      // Updates totalSupply
        return true;
    }
     
}
function transfer(address to, uint tokens) public returns (bool success){
         require(balances[msg.sender] >= tokens && tokens > 0);
         
         balances[to] += tokens;
         balances[msg.sender] -= tokens;
         emit Transfer(msg.sender, to, tokens);
         return true;
     }
//transfer from the owner balance to another address