Hi. It seems that you are interested in making a simple C program with the following capabilities:
1. make arrays and do computations (e.g. arithmetic mean) on them
2. make structures, update data in structures from user input and display all the data on the screen
3. append new data to a text file, read and display the text data
4. process the text data and display only the subset of data that satisfies the requirements.
I am a software engineer and have extensive experience in C/C++, MatLab, and python. I strongly feel that I can help you get this project done.
Further, I will write highly documented, well-commented code so that you can understand it as well.
I would like to speak to you more about the project to understand it in more detail. Let me know if you think I can help you.
Regards,
Muzammil