Multichain-token install dependencies npm install flatten contract npx hardhat flatten internal/MultichainToken.sol | sed '/SPDX-License-Identifier:/d' | sed 1i'// SPDX-License-Identifier: GPL-3.0-or-later' > contracts/MultichainToken.sol compile use hardhat npx hardhat compile use remix https://remix.ethereum.org/#optimize=true&evmVersion=null&version=soljson-v0.8.6+commit.11564f7e.js&runs=200