re-implementing a set of Libc functions + some others to rust

I tried to follow the same limitations that the 'libft' subject gives us, such as limiting memory allocation in fuctions that don't use it in the libc. However I folowed the originial limitations of the project and their c implementations loosly.

• Note: (click on func name to view source code)
• Note: (🧪): means unit tests are written for the function
• Note: (click on 🧪 to view unit tests)
• Note: (⏳): means function under progress

1. output to stdout:

• ft_putchar
• ft_putstr
• ft_putendl
• ft_putnbr

1. output to file:

• ft_putchar_fd 🧪
• ft_putstr_fd 🧪
• ft_putendl_fd
• ft_putnbr_fd 🧪

• ft_itoa 🧪
• ⏳ ft_atoi
• ft_toupper
• ft_tolower

• ft_isalpha
• ft_isdigit
• ft_isalnum
• ft_isascii
• ft_isprint

• ft_strcmp
• ft_strncmp
• ft_strequ
• ft_strnequ
• ft_strsub
• ft_strjoin
• ft_strtrim
• ft_strsplit
• ft_strlen
• ft_strdup
• ft_strcpy
• ft_strncpy
• ft_strcat
• ft_strncat
• ft_strlcat
• ft_strchr
• ft_strrchr
• ft_strstr
• ft_strnstr

• ft_memset
• ft_bzero
• ft_memcpy
• ft_memccpy
• ft_mesmmove
• ft_memchr
• ft_memcmp

• ft_lstnew
• ft_lstdelone
• ft_lstdel
• ft_lstadd
• ft_lstiter
• ft_lstmap