How i add if statement in merkle list

how i add if statement in merkle list

 require(isValid(proof, keccak256(abi.encodePacked(msg.sender))), "Not a part of Allowlist");```

i want add merkle tree "isValid proof" like below in if statement

            if (isWhitelisted[msg.sender]) {
            } else {
               
            }

please guide me

Instead of require just use if() and inside the if body ads the logic you want

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