The repository implements wrapped FTM tokens used to normalize DeFi tokens use with the native tokens. Native FTMs can be freely wrapped into the ERC20 wFTM and unwrapped back to FTM without a fee. The only cost involved is the transaction fee of the exchange contract call.
Please note we use OpenZeppelin library version 2.5 along with the Solidity 0.5 and truffle to conform with the EVM implemented in the Opera block chain. Consult the Truffle documents to find out how to build and deploy the smart contract implemented here.
In general, all you should need to do is to call truffle build
to get the deployable contract code and ABI inside build/ folder.