MahmoudFawzyKhalil's implementation

[MahmoudFawzyKhalil]

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
• [ ] For new entries, or after substantial changes: When implementing custom hash structures, please point to where you deal with hash collisions (line number)

Apple M1 Macbook Pro, 8 Cores, 16GB RAM

• Execution time: 32.02s
• Execution time of reference implementation: 3.29m