refactoring pgm_txtfile_generator

Description:
The pgm_txtfile_generator module in the current project requires refactoring to improve its readability and maintainability, without altering its existing functionality. It is crucial to have a codebase that is easy to understand, modify, and debug. This will not only enhance the development process but also ensure the robustness and reliability of the software.

User Story:
As a C developer for AVR MCU, I require the pgm_txtfile_generator module to be highly readable and maintainable, enabling efficient understanding, modification, and debugging without compromising its existing functionality.