exam_processor

To use:

1. git clone https://github.com/0xMacro/exam_processor.git
2. cd exam_processor
3. npm install
4. npx hardhat test

At this stage ExamResultProcessor and ImprovedProcessor should have similar gas consumption as they are identical. Modify contracts/ImprovedProcessor.sol to reduce its gas counsumption. Keep ExamResultProcessor unchanged as a reference.