ft_list_size

Assignment name  : ft_list_size
Expected files   : ft_list_size.c, ft_list.h
Allowed functions:
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Write a function that returns the number of elements in the linked list that's
passed to it.

It must be declared as follows:

int	ft_list_size(t_list *begin_list);

You must use the following structure, and turn it in as a file called
ft_list.h:

typedef struct    s_list
{
    struct s_list *next;
    void          *data;
}                 t_list;