"Why?" you ask. Because ft_printf has hundreds of edge cases (padding, width, precision, flags). The micro-shell is binary: either it executes ls correctly, or it doesn't. If you memorize the structure, you can write it in 30 minutes.
Here is the mental template you need to have memorized: 42 Exam Rank 03
If you get stuck, re-read the subject completely. Students routinely lose points for missing a single included library or failing to return the correct integer value on an error. Always run your code through valgrind at home to trace any hidden memory leaks before exam day. If you memorize the structure, you can write
Solving problems efficiently, as time constraints are strict. Always run your code through valgrind at home
If the draw is get_next_line , the trial is one of static variables and file descriptor management. The student must read from a file descriptor line by line, preserving state between function calls. Memory leaks, buffer overflow, and the dreaded "double free" are constant companions. One misplaced static variable can cause a segmentation fault on line 42 of the test suite.