📄 get_next_line

get_next_line is a function that reads and returns one line at a time from a file descriptor.
This project is part of the 42 school curriculum and focuses on low-level file I/O, memory management, and the use of static variables.

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🧠 Project Objective

The objective of get_next_line is to implement a function that:

• Reads from a file descriptor using a buffer of fixed size
• Returns a full line, ending with \n (if present)
• Handles incomplete reads and buffers properly
• Manages memory and leftover data between function calls using a static variable