Pointer Variable Not Increasing

Question

I am trying to create a phonebook program that allows me to add contacts, remove contacts, and displays the whole phonebook, but I added in some debugging printf statements to see what was going wrong and I saw that my variable for bookSize was never increasing.

I am unsure how I can fix it. I can create contacts but each new one will replace the old one.

#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <stdbool.h>

typedef struct //Contact structure
{
    char fname[20], lname[20];
    int phoneNum;
} contact;
   
int addContact(contact*, contact, int*); //Add a contact

int removeContact(contact*, contact, int*); //Remove a contact

void showBook(contact*, int*); //Show the phonebook

int main()
{
    //Variables
    int menu = 0, phoneNum, userIn;
    contact *friends = malloc(1 * sizeof(contact));
    int bookSize = 1;
    char fname[20], lname[20];
    
    do
    {
        printf("-=-=-=-=-=-=-=-=-=-=Digital Phonebook=-=-=-=-=-=-=-=-=-=-\n");
        printf("Menu: \n");
        printf("1: Add Contact\n");
        printf("2: Remove Contact\n");
        printf("3: Show Contact List\n");
        printf("4: Exit Menu\n");
        
        scanf("%d", &userIn); //Menu select
        
        if (userIn == 1) //Add Contact
        {
            contact newContact;
            
            printf("Enter the first name: ");
            scanf("%s", &newContact.fname);
            
            printf("Enter the last name: ");
            scanf("%s", &newContact.lname);
            
            printf("Enter the phone number: ");
            scanf("%d", &newContact.phoneNum);
            
            addContact(friends, newContact, &bookSize);
        }
        else if (userIn == 2) //Remove contact
        {
            contact oldContact;
            
            printf("First name of the contact you wish to delete: ");
            scanf("%s", &oldContact.fname);
            
            printf("Enter the last name: ");
            scanf("%s", &oldContact.lname);
            
            removeContact(friends, oldContact, &bookSize);
        }
        else if (userIn == 3) //Show phone book
        {
            showBook(friends, &bookSize);
        }
        else if (userIn == 4) //Exit menu
        {
            menu = 1;
            break;
        }
        
        
    } while (menu == 0);
    
    return 0;
}

int addContact(contact *friends, contact newContact, int *bookSize)
{
    contact *temp;
    
    int sizeOfBook = *bookSize;
    
    printf("\n%d\n", *bookSize); //Debug
    
    *bookSize++;
    temp = realloc(friends, sizeOfBook * sizeof(friends));
    if (temp == NULL)
        printf("Allocation failed: Out of memory.\n");
    else
    {
        friends = temp;
        strcpy(friends[sizeOfBook-1].fname, newContact.fname);
        strcpy(friends[sizeOfBook-1].lname, newContact.lname);
        friends[sizeOfBook-1].phoneNum = newContact.phoneNum;
    }
    
    printf("\n%d\n", *bookSize); //Debug
}




int removeContact(contact *friends, contact oldContact, int *bookSize)
{   
    int i=0;
    int temp = bookSize;
    
    char fname[20],lname[20];
    
    if(bookSize==0)
    {
        printf("List is empty\n\n");
        return 0;
    }
    
    while(i<temp)
    {
        if(strcmp(friends[i].fname,fname) == 0 && strcmp(friends[i].lname,lname) == 0)
        {
            int y = i;
            if(temp == 1)
                temp = 0;
    
            while(y < temp - 1)
            {
                friends[y] = friends[y + 1];
                y++;
            }
        temp--;
        printf("Record deleted from the phone book\n\n");
        *bookSize--;
        break;
        }
        i++;
    }
    if(i == temp)
        printf("Record Not In the List\n\n");
    return 0;
    
}


void showBook(contact *friends, int *bookSize)
{
    int i=0;
    
    printf("\n%d\n", *bookSize); //Debug
    
    while(i < *bookSize)
    {
        printf("%d) %s %s %d \n\n", i+1, friends[i].fname, friends[i].lname, friends[i].phoneNum);
        i++;
    }
    
}