4.1

#include<stdlib.h>
#include<stdio.h>
#include<string.h>
//error in  the end and sapce
#define MAX 256



typedef struct{
	char code[10];
	char *name;//dinamic allocation

}Book;

typedef struct{
	char *name;
	int num_books;
	Book *array;//dinamic
}Library;


void Get_Lost(char* str);
void input_book(Book* B, FILE *in);
void input_library(Library *L, FILE *in);
void output_book(Book* B, FILE *out);
void output_library(Library* L, FILE *out);

int main()
{
	FILE *in, *out;
	Library Libr;
	int i;

	in = fopen("input.txt", "r");
	input_library(&Libr, in);
	fclose(in);

	out = fopen("output.txt", "w");
	output_library(&Libr, out);
	fclose(out);

	for (i = 0; i < Libr.num_books; i++)//why?
		free(&Libr.array[i]);
		return 0;
}
//free

void Get_Lost(char* str)
{
	printf("\n%s", str);
	exit(1);
}

void input_book(Book* B, FILE *in)
{
	int i;
	char temp[MAX];
		fscanf(in, "%s",&B->code);
	fscanf(in, "%s", temp);
	B->name = (char*)malloc(strlen(temp)*sizeof(char));
	if (B->name == NULL)
	{
		printf("Allocation failed");
		exit(1);//check
	}
	strcpy(B->name, temp);

}
void input_library(Library *L, FILE *in)
{
	int i;
	char temp[MAX];
	fscanf(in, "%s", temp);
	L->name = (char*)malloc(strlen(temp)*sizeof(char));
	if (L->name == NULL)
	{
		printf("Allocation failed");
		exit(1);//check
	}
	strcpy(L->name, temp);
	fscanf(in, "%d", &L->num_books);
	L->array = (Library*)malloc(L->num_books*sizeof(Library));
	if (L->array == NULL)
	{
		printf("Allocation failed");
		exit(1);//check
	}
	//fill book struct array
	for (i = 0; i < L->num_books; i++)
		input_book(&L->array[i], in);//WHY?
}
void output_book(Book* B, FILE *out)
{


	fprintf(out, "\n%s %s",B->code, B->name);//HOW TO SPACE LIKE THAT?

}
void output_library(Library* L, FILE *out)
{
	int i;
	fprintf(out, "%s, %d",L->name, L->num_books);
	for (i = 0; i < L->num_books; i++)
		output_book(&L->array[i], out);

}
/*
FILE *p;
p=fopen("out", "w");

fclose(p);*/