Recode libc's printf function.

At 42, Students must write all their own functions from scratch.
Normal library functions such as realloc, strjoin, strdup, etc., are strictly forbidden.

ft_printf must achieve the following requirements:

• Manage the following conversions: s, S, p, d, D, i, o, O, u, U, x, X, c & C
• Manage %%
• Manage the flags #, 0, -, + & space
• Manage the minimum field-width
• Manage the precision
• Manage the flags hh, h, l, ll, j, & z.

ft_printf must conform to the 42 Norm. It must not have any leaks. Errors must be handled carefully.
In no way can it quit in an unexpected manner (segmentation fault, bus error, double free, etc).

ft_printf must be formatted and behave in the same way as libc's printf:

  ft_printf("%d is the answer to %s, %s, and %s.", 42, "life", "the universe", "everything");
  printf("%d is the answer to %s, %s, and %s.", 42, "life", "the universe", "everything");

Should output:

  42 is the answer to life, the universe, and everything.
  42 is the answer to life, the universe, and everything.

Run make. This will compile libftprintf.a. To use, include ft_printf.h and use just like printf:

#include <ft_printf.h>

int     main(void)
{
  ft_printf("%s\n", "Hello World");
  return(0);
}

Then compile with a program:

$> gcc -Wall -Werror -Wextra main.c libftprintf.a -I includes