The return value of some external calls are not stored in a local or state variable nor checked.
In the contracts indicated in the "Relevant GitHub Links", there are instances where external methods are being called, and the return values are ignored.
Similar findings from other contests:
https://solodit.xyz/issues/unused-returns-halborn-matrixswap-staking-pdf
Manual Analysis.
Add return value check to avoid unexpected crash of the contract. Return value check will help in handling the exceptions better way.
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