Renamed functions and fixed prototype

[alelievr]

Hello, I don't understand this PR :)

The libft subject haven't changed right ? I see that in the subject it's still

char * ft_strsub(char const *s, unsigned int start, size_t len);
char * ft_strtrim(char const *s);

Did i missed something ?

[cacharle]

The subject I received changed

• ft_strsub to ft_substr
• ft_strsplit to ft_split
• the prototype of ft_strtrim became char *ft_strtrim(char const *s1, char const *set);\

They also added bonus functions and how those functions are evaluated. We have to add a _bonus at the end of the file name containing the bonus function, we also have to add a bonus rule to our Makefile which compile the bonus.

Here is the pdf I got: https://github.com/HappyTramp/libft/blob/master/subject.en.pdf

[alelievr]

Ha yes ok, it makes sense :)

I guess that i'll merge that into master and create a new branch for the "old" libft subject so people can still use it