Balalalala

#include<stdio.h>
#include<stdlib.h>
typedef struct node
{
    int a;
    char b[50];
    char c[50];
    struct node *next, *prev;
}node;

node *head=NULL, *tail=NULL;

void addbooks()
{
    node *N=(node*)malloc(sizeof(node));
    printf("Enter Book ID:\n");
    scanf("%d", &N->a);
    printf("Enter Book Name:\n");
    scanf(" %[^\n]", N->b);
    printf("Enter the Author Name:\n");
    scanf(" %[^\n]", N->c);
    N->next=NULL;
    N->prev=NULL;

    if(head==NULL)
    {
        head=N;
        tail=N;
    }
    else
    {
        tail->next=N;
        N->prev=tail;
        tail=N;
    }
    printf("The record is sucessfully saved!\n");
    printf("   1. Menu\n");
    printf("   2. Exit\n");
    printf("   3. Add Books Again.\n");
    printf("\nChoose an option.\n");
    int y;
    scanf("%d",&y);
    switch(y)
    {
    case 1:
    {
        menu();
        break;
    }
    case 2:
    {
        exit(0);
        break;
    }
    case 3:
        {
            addbooks();
            break;
        }
    default :
    {

        printf("You've Chosen A Wrong Option!!\n\n");
        menu();
        break;
    }
    }
}

void delete_by_value()
{
    node *temp;
    node *list=head;
    {
        int x;
        printf("Enter the BookID:\n");
        scanf("%d", &x);

        if(head==NULL)
        {
            printf("There's Nothing Still.\n");
        }
        else
        {
        if(head->a==x)
        {
            temp=head;
            head=temp->next;
            free(temp);
        }
        else if(tail->a==x)
        {
            temp=tail;
            temp->prev->next=NULL;
            tail=temp->prev;
            free(temp);
        }
        else
        {
            while(list->next->a!=x && list->next->next!=NULL)
            {
                list=list->next;
            }
            temp=list->next;
            temp->prev->next=temp->next;
            temp->next->prev=temp->prev;
            free(temp);
        }
        }
    }
    printf("The record is sucessfully deleted!!\n");
    printf("   1. Delete Book Again.\n");
    printf("   2. Menu\n");
    printf("   3. Exit\n");
    printf("\nChoose an option.\n");
    int z;
    scanf("%d",&z);
    switch(z)
    {
        case 1:
        {
            deletebooks();
            break;
        }
    case 2:
    {
        menu();
        break;
    }
    case 3:
    {
        exit(0);
        break;
    }
    default :
    {
        printf("You've Chosen A Wrong Option!!\n\n");
        menu();
        break;
    }
    }
}

void delete_by_name()
{
    node *temp;
    node *list=head;
    {
        char x;
        printf("Enter the Book Name:\n");
        scanf(" %[^\n]", x);

        if(head==NULL)
        {
            printf("There's Nothing Still.\n");
        }
        else
        {
        if(head->b==x)
        {
            temp=head;
            head=temp->next;
            free(temp);
        }
        else if(tail->b==x)
        {
            temp=tail;
            temp->prev->next=NULL;
            tail=temp->prev;
            free(temp);
        }
        else
        {
            while(list->next->b!=x && list->next->next!=NULL)
            {
                list=list->next;
            }
            temp=list->next;
            temp->prev->next=temp->next;
            temp->next->prev=temp->prev;
            free(temp);
        }
        }
    }
    printf("The record is sucessfully deleted!!\n");
    printf("   1. Delete Book Again.\n");
    printf("   2. Menu\n");
    printf("   3. Exit\n");
    printf("\nChoose an option.\n");
    int z;
    scanf("%d",&z);
    switch(z)
    {
        case 1:
        {
            deletebooks();
            break;
        }
    case 2:
    {
        menu();
        break;
    }
    case 3:
    {
        exit(0);
        break;
    }
    default :
    {
        printf("You've Chosen A Wrong Option!!\n\n");
        menu();
        break;
    }
    }
}

void deletebooks()
{
    printf("   1. Delete by BookID\n");
    printf("   2. Delete by BookName\n");
    printf("\nChoose an option.\n");
    int z;
    scanf("%d",&z);
    switch(z)
    {
        case 1:
        {
            delete_by_value();
            break;
        }
        case 2:
            {
                delete_by_name();
                break;
            }
    case 3:
    {
        exit(0);
        break;
    }
    default :
    {

        printf("You've Chosen A Wrong Option!!\n\n");
        menu();
        break;
    }
    }
}


void display()
{
    node *list=head;
    while(list!=NULL)
    {
        printf("Book ID: %d\n", list->a);
        printf("Book Name: %s\n", list->b);
        printf("Author Name: %s\n", list->c);
        list=list->next;
    }
}

void menu()
{
    printf("\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2 MAIN MENU \xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2\xB2\n");
    printf("    1.Add\n");
    printf("    2.Delete\n");
    printf("    3.Search\n");
    printf("    4.Display\n");
    printf("    5.Exit\n");
    printf("Choose a option:");
    int x;
    scanf("%d",&x);
    switch(x)
    {
    case 1:
    {
        addbooks();
        break;
    }
    case 2:
    {
        deletebooks();
        break;
    }
    case 3:
    {
        exit(0);
        break;
    }
    default :
    {

        printf("You Choose A Wrong option!!\n\n");
        menu();
        break;
    }
    }
}

int main()
{
    menu();
    return 0;
}