autosized arrays

Description:
The current implementation of the pgm_txtfile_generator can be optimized for better performance and efficiency. As a C developer for AVR MCU, it is crucial to have a function that can create fixed-sized arrays with strings, without consuming excessive program memory. The function should take an array with a fixed number of character pointers to variable-sized strings. Given that each array consumes 2 bytes of RAM, it is essential for the function to provide an efficiency report detailing the memory usage in percentage terms, allowing the developer to make an informed decision.

User Story:
As a C developer for AVR MCU, I need a function that creates fixed-sized arrays with strings, optimizes program memory usage, and provides a report on memory efficiency, so that I can manage memory resources effectively while developing.