Deployed a Simple Online Wallet on XinFin XDC Network

address payable internal owner; string internal ownerName; string internal dappsName; uint256 internal reserveToken; uint32 internal decimals; event TransferToken(address source, address destination, uint amount); // BC will log event transferToken struct account { string name; uint256 token; } mapping(address => account) internal myAccount; constructor () public { owner = msg.sender; // the one submited this smart contract into BC ownerName = "iExploTech BC Tutorial"; dappsName = "Simple Online Wallet Tutorial"; decimals = 3; // 3 precision point of fraction number reserveToken = 1000000 * 10**uint(decimals); // 1 Million Tokens with 3 precision point of fraction number. e.g. 0.001 cent emit TransferToken(address(0), owner, reserveToken); // publish generated tokens to BC logs } modifier onlyOwner() { require(msg.sender == owner); // only smart contract owner is authorized to execute functions _; } // require gas to execute, only smart contract owner is authorized to add new account and disperse new tokens function addAccount( string memory newName, address newAddress, uint256 newToken) public onlyOwner { if(newToken <= reserveToken) { myAccount[newAddress].name = newName; myAccount[newAddress].token = newToken; reserveToken = sub(reserveToken, newToken); //reserveToken = reserveToken - newToken; } else revert("Not Enough Reserve Token"); // will undo all state changes, it will refund any remaining gas to the caller } // require gas to execute, only smart contract owner is authorized to change account name function changeAccountName( string memory newName, address newAddress) public onlyOwner { myAccount[newAddress].name = newName; } // require gas to execute, only smart contract owner is authorized to disperse additional tokens function disperseToken(address newAddress, uint256 newToken) public onlyOwner { if(newToken <= reserveToken && newToken!= 0) { myAccount[newAddress].token = newToken; reserveToken = sub(reserveToken, newToken); //reserveToken = reserveToken - newToken; } else revert("Not Enough Reserve Token"); // will undo all state changes, it will refund any remaining gas to the caller } function transferToken(address newRecipient, uint256 newToken) public { if(myAccount[msg.sender].token >= newToken && newToken!= 0) { myAccount[newRecipient].token = add(myAccount[newRecipient].token, newToken); // myAccount[newRecipient].token = myAccount[newRecipient].token + newToken; myAccount[msg.sender].token = sub(myAccount[msg.sender].token, newToken); // myAccount[msg.sender].token = myAccount[msg.sender].token - newToken; emit TransferToken(msg.sender, newRecipient, newToken); // publish transferred tokens to BC logs } else revert("Not Enough Token"); // will undo all state changes, it will refund any remaining gas to the caller } function displayReserveToken() public onlyOwner view returns (uint256 ReserveToken) { return reserveToken; } function displayMyAccountInfo () public view returns (string memory Name, address Account, uint256 Eth_Wei, uint256 Token) { return (myAccount[msg.sender].name, msg.sender, msg.sender.balance, myAccount[msg.sender].token); } function displayOwner() public view returns (string memory Name, address Account, string memory DAppsName) { return (ownerName, owner, dappsName); } // Destroy smartcontract in blockchain. This smart contract cannot be accessed after this command. Old data still exist in blockchain. function kill() public onlyOwner { selfdestruct(owner); }