adding prototype in push_swap.h and norming some files

stack_utils/push.c

@@ -29,11 +29,8 @@ void	pa(t_stacks *stacks)
 		stacks->b = stacks->b->next;
 	}
 	stack_add_front(&(stacks->a), b_push);
-
 }
 
-#include <stdio.h>
-
 void	pb(t_stacks *stacks)
 {
 	t_stack	*a_push;