contract EquitoERC20 is EquitoApp, ERC20 {
   function crossChainTransfer(
       bytes64 calldata receiver,
       uint256 destinationChainSelector,
       uint256 amount
   ) external payable {
       _burn(msg.sender, amount);
       bytes memory data = abi.encode(receiver, amount);
       router.sendMessage{value: msg.value}(
           peers[destinationChainSelector],
           destinationChainSelector,
           data
       );
   }    function _receiveMessageFromPeer(
       EquitoMessage calldata message,
       bytes calldata messageData
   ) internal override {
       (bytes64 memory receiver, uint256 amount) = abi.decode(
           messageData,
           (bytes64, uint256)
       );
       _mint(EquitoMessageLibrary.bytes64ToAddress(receiver), amount);
   }
}