all linked list

#include<stdio.h>
#include<stdlib.h>
#include<string.h>
typedef struct node                 //STRUCTURE///////////////////////////////////////////////////
{
    char name[30];
    char phone[20];
    struct node *next;
} node;
node *head=NULL;

int Add()                          // ADD FUNCTION////////////////////////////////////////////////
{
    int pos,option;
    printf("\t\t\t\t1.Add at First Position\t\t2.Add at Last Position\n");
    printf("\t\t\t\t\t\t  3.Add at n'th Position\n\n");
    scanf("%d",&option);
    if(option==1)
    {
        node *n=(node*)malloc(sizeof(node));  //ADD___AT___FIRST///////////////////////////////////
        n->next=NULL;
        printf("Enter The Name:\n\n");
        scanf(" %[^\n]",n->name);
        printf("Enter The Phone Number:\n\n");
        scanf(" %[^\n]",n->phone);
        n->next=head;
        head=n;
        menu();

    }
    else if(option==2)                   //ADD__AT__LAST//////////////////////////////////////////////////
    {
        node *n=(node*)malloc(sizeof(node));
        n->next=NULL;
        printf("\t\t\t\t\t\tEnter The Name:\n\n");
        scanf(" %[^\n]",n->name);
        printf("\t\t\t\t\t\tEnter The Phone Number:\n\n");
        scanf(" %[^\n]",n->phone);
        node *list=head;
        if(list==NULL)
        {
            head=n;
            printf("\t\t\t\t\t\ Successfully Added to the last Position\n\n");
            menu();

        }
        else
        {
            while(list->next!=NULL)
            {
                list=list->next;
            }
            list->next=n;
            menu();
        }
    }
    else if(option==3)       //ADD__AT__nth__POSITION////////////////////////////////////////////////////
    {
        printf("\t\t\t\t\t\tEnter the position:\n\n");
        scanf("%d",&pos);
        node *n=(node*)malloc(sizeof(node));
        n->next=NULL;
        printf("\t\t\t\t\t\tEnter The Name:\n\n");
        scanf(" %[^\n]",n->name);
        printf("\t\t\t\t\t\tEnter The Phone Number:\n\n");
        scanf(" %[^\n]",n->phone);
        node *list=head;
        if(pos==1)
        {
            n->next=head;
            head=list;
            menu();
        }
        else if(pos%1==0)
        {
            pos=pos-2;
            while(pos!=0 && list->next!=NULL)
            {
                list=list->next;
            }
            n->next=list->next;
            list->next=n;
            menu();

        }

    }
    else
    {

        printf("\t\t\t\t\t\tYou have entered a wrong command, Follow the steps again\n\n");
        Add();

    }
}



int Delete()           //DELETE__FUNCTION///////////////////////////////////////////////////////////
{
    int option,pos;
    char test[30];
    node *list,*temp;
    printf("\t\t\t\t\t\t1.Delete by Position\t\t2.Delete by Matching Name\n\n");
    scanf("%d",&option);
    if(option==1)           //DELETE__BY__POSITION/////////////////////////////////////////////////////
    {
        printf("\t\t\t\t\t\tEnter the Position\n\n");
        scanf("%d",&pos);
        if(pos==1)
        {
            temp=head;
            head=head->next;
            free(temp);
            printf("\t\t\t\t\t\tSuccessfully Deleted the Data\a\n");
            menu();
        }
        else
        {
            pos=pos-2;
            list=head;
            while(pos!=0 && list->next!=NULL)
            {
                list=list->next;
                pos--;
                if(list==NULL){
                    printf("There is No %dth Position\n\n",pos);
                    menu();                }
            }
            temp=list->next;
            list->next=temp->next;
            free(temp);
            printf("\t\t\t\t\t\tSuccessfully Deleted the Data\n");
            menu();
        }
        menu();

    }
    else if(option==2)           //DELETE__BY__Name/////////////////////////////////////////////////
    {
        printf("\t\t\t\t\t\tEnter the Name you want to Delete\n\n");
        scanf(" %[^\n]",test);
        list=head;
        if(strcmp(test,list->name)==0)
        {
            head=list->next;
            free(list);
            printf("\t\t\t\t\t\tSuccessfully Deleted the Data\n");
            menu();
        }
        else
        {
            list=head;
            while(strcmp(list->next->name,test)!=0 && list!=NULL)
            {
                list=list->next;
            }
            temp=list->next;
            list->next=temp->next;
            free(temp);
            printf("\t\t\t\t\t\tSuccessfully Deleted the Data\n");
            menu();
        }
    }
    else
    {
        printf("\t\t\t\t\t\tYou have entered a wrong command, Follow the steps again\a\n\n");
        Delete();
    }
    }
int display()          //DISPLAY__FUNCTION/////////////////////////////////////////////
{
    int count=0;
    node *list=head;
    while(list!=NULL)
    {
        count++;
        printf("\t\t\t\t\t\t%d NO. BLOCK\n\t\t\t\t\t\tName : %s\n\t\t\t\t\t\tPhone Number : %s\n",count,list->name,list->phone);
        list=list->next;
    }
    menu();
}

int search()           //////Search_FUNCTON////////////////////////////////////
{
    char test[30];
    int option,count=0;
    node *list=head;
    printf("\t\t\t\t1.Search by name\t\t2.Search by Phone number\n");
    scanf("%d",&option);
    if (option==1){             //////SEARCH_BY_NAME////////////////////////////////////////////
        printf("\t\t\t\t\t\tEnter the name\n\n");
        scanf(" %[^\n]",test);
        while(list!=NULL){
            if(strcmp(test,list->name)==0){
                printf("\t\t\t\t\t\t%d NO. BLOCK\n\t\t\t\t\t\tName : %s\n\t\t\t\t\t\tPhone Number : %s\n",count,list->name,list->phone);
                count++;
            }
            list=list->next;

        }
        if(count==0){
            printf("\t\t\t\t\t\tNot Found Your Data\a\n\n");
            menu();
        }
        menu();
    }
    if(option==2){   // Search_BY_PHONE_NUMBER////////////////////////////////////////////////////
        printf("Enter The Phone Number:\n\n");
        scanf(" %[^\n]",test);
        while(list!=NULL){
            if(strcmp(test,list->phone)==0){
                printf("\t\t\t\t\t\t%d NO. BLOCK\n\t\t\t\t\t\tName : %s\n\t\t\t\t\t\tPhone Number : %s\n",count,list->name,list->phone);
                count++;
            }
            list=list->next;
        }
        if(count==0){
            printf("\t\t\t\t\t\tNot Found Your Data\a\n\n");
            menu();
        }
        menu();
    }
    else{
        printf("\t\t\t\t\t\tYou have Entered wrong command, Automatically terminated to Menu\n\n");
        menu();
    }
    menu();

}

int menu()
{
    int n;
    printf("\n\n");
    printf("\t\t\t\t1.Add a new Contact\t\t2.Delete an Contact\n");
    printf("\t\t\t\t3.Search an Contact\t\t4.Display all Contact\n");
    printf("\t\t\t\t\t\t  5.End The Program\n\n\n\n");
    scanf("%d",&n);
    if(n==1)
    {
        Add();
    }
    else if(n==2)
    {
        Delete();
    }
    else if(n==3){
        search();
    }
    else if(n==4)
    {
        display();
    }
    else if(n==5)
    {
        exit(0);
    }
    else
    {
        printf("\t\t\t\t\t\tYou have Entered wrong command, Automatically terminated to Menu\n\n");
        menu();
    }

}

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