checkAccessLevelExists

This view function checks if a specific access level exists for a given event. It takes two parameters:

• _eventId: The unique identifier for the event.

• _accessLevel: The access level to be checked for existence.

// Some code

```remix-solidity
/**
    CheckAccessLevelExists: Check if a specific access level exists for a given event.
    @param _eventId: The unique identifier for the event.
    @param _accessLevel: The access level to be checked for existence.
    @return bool: A boolean indicating whether the access level exists for the event.
    */
    function checkAccessLevelExists(
        string calldata _eventId,
        string calldata _accessLevel
    ) public view returns (bool) {
        // Retrieve all access levels associated with the event
        string[] memory _accessLevels = getAccessLevelsFromEventId(_eventId);
        // Loop through access levels to check for the existence of the specified access level
        for (uint256 i = 0; i < _accessLevels.length; ++i) {
            if (
                keccak256(bytes(_accessLevel)) ==
                keccak256(bytes(_accessLevels[i]))
            ) {
                return true;
            }
        }
        return false;
    }
```

Explanation:

The function retrieves all access levels associated with the event using the getAccessLevelsFromEventId function. Then, it iterates through these access levels to check if the specified access level exists among them. It compares the keccak256 hashes of the access level strings to determine a match. If a match is found, indicating that the access level exists for the event, the function returns true; otherwise, it returns false.