libft is a 42School project which creates a first C library with convenience functions. Some are reprogrammed libc functions, some our own convenience functions, some linked list functions.
The project description is in libft16.pdf.

This project was written for and compiled on a Mac.

make bonus

This yields a file libft.a.

Then you have to include the header file in your code

#include "libft.h"

and link the library

gcc -o main main.c -L<path to libft.a> -lft

This project was a 42School project, we had to program according to a strict norm, for instance using only while loops, having only 25 lines per function, using no inline comments etc.