Audit Smart Contracts

We need to audit smart contracts.
Smart contracts https://gitlab.com/dune-network/ton-merge/-/tree/master/contracts/free-ton
Integration tests https://gitlab.com/dune-network/ton-merge/-/tree/master/tests/free-ton
Test deployment https://merge.dune.network/
Docs https://gitlab.com/dune-network/ton-merge/-/tree/master/doc