Felix19350 2nd submission with additional improvements to the parsing logic

[felix19350]

Check List:

• [X] Tests pass (./test.sh <username> shows no differences between expected and actual outputs)
• [X] All formatting changes by the build are committed
• [X] Your launch script is named calculate_average_<username>.sh (make sure to match casing of your GH user name) and is executable
• [X] Output matches that of calculate_average_baseline.sh

• Execution time: 0:32.44
• Execution time of reference implementation: 4:03.22