PanicErrorExample.sol

// SPDX-License-Identifier: GPL-3.0
pragma solidity ^0.8.0;

contract PanicErrorExample {

    function countTrailingZeroBytes(bytes32 data) public pure returns (uint256) {
        uint256 index = 31;

        // CHECK each bytes of the key, starting from the end (right to left)
        // skip each empty bytes `0x00` to find the first non-empty byte
        while (data[index] == 0x00) index--;

        return 32 - (index + 1);
    }

}