Hotfixes #1 added, details written in issues log

[mc-putchar]

1. ft_bzero - change from char to unsigned char
   

2. ft_lstmap - add null check for (*f) return before passing to ft_lstnew
   

3. ft_memccpy - change from int to unsigned char casting
   

4. ft_memcpy - change from char to unsigned char casting
   

5. ft_memmove - change from char to unsigned char casting
   

6. ft_memset - change from char to unsigned char casting
   

7. ft_put* - change return type to ssize_t, return bytes printed