libft: reinventing the wheel?

So I'm still in Brazil applying for my visa, but I can already start developing my projects from 42 so let's talk a little about the first project.

It's very common for us to use the standard C library functions like printf, atoi, malloc, strdup, and many others. However, most people never stop to think about how these functions actually work, the code behind them that we never see.

For this first project, I had to rewrite a set of functions from the libc. They have the same prototypes and implement the same behaviors as the originals. In future projects, I will only be allowed to use these functions I wrote and not the original ones.

Here are the functions I recreated:

// 	Functions from libc
isalpha()			strlcpy()
isdigit()			strlcat()
isalnum()			strlen()
isascii()			strchr()
isprint()			strrchr()
memset()			strncmp()
memcmp()			strnstr()
memcpy()			strdup()
memmove()			toupper()			
memchr()			tolower()
bzero()				atoi()
calloc()

//	Additional functions
ft_substr()			ft_strjoin()
ft_strtrim()		ft_putnbr_fd()
ft_split()			ft_putendl_fd()
ft_itoa()			ft_putstr_fd()
ft_strmapi()		ft_putchar_fd()
ft_striteri()

//	Linked-list manipulation functions
ft_lstnew()			ft_lstmap()
ft_lstadd_front()	ft_lstiter()
ft_lstadd_back()	ft_lstclear()
ft_lstsize()		ft_lstdelone()

To see details of each function check the repository below, and the PDF with the instructions for the project, inside the repo: