Program crashing near the end of compiling - c

Question

I've got a program for taking input and storing it into structs. The structs are for contact details, Name, Address, and Phone numbers. My program works just fine, I can enter all my information into the program however when I try to printf the results the program crashes halfway through. I think they may be an issue with memory or corruption, or something. The reason I think it may be with corruption is because if I cut off some of my program and compile it, instead of the program crashing I get a 'Run-Time check failure #2 Stack around the variable 'optionAddress' was corrupted' error. Here's my program
#define _CRT_SECURE_NO_WARNINGS
#include <stdio.h>
#include "contacts.h"
int main(void)
{
// Declare variables here:
struct Name names;
char optionName;
struct Address addresses;
char optionAddress;
struct Numbers number;
char optionCell;
char optionHome;
char optionBusiness;
// Display the title
printf("Contact Management System\n");
printf("-------------------------\n");
// Contact Name Input:
printf("Please enter the contact's first name: ");
scanf("%s", &names.firstName);
printf("Do you want to enter a middle initial(s)? (y or n): ");
scanf("%s", &optionName);
while (optionName == 'y' || optionName == 'Y') {
printf("Please enter the contact's middle initial(s): ");
scanf("%s", &names.middleInitial);
break;
}
printf("Please enter the contact's last name: ");
scanf("%s", &names.lastName);
// Contact Address Input:
printf("Please enter the contact's street number: ");
scanf("%s", &addresses.streetNumber);
printf("Please enter the contact's street name: ");
scanf("%s", &addresses.street);
printf("Do you want to enter an apartment number? (y or n): ");
scanf("%s", &optionAddress);
while (optionAddress == 'y' || optionAddress == 'Y') {
printf("Please enter the contact's apartment number: ");
scanf(" %c", &addresses.apartmentNumber);
break;
}
printf("Please enter the contact's postal code: ");
scanf("%s", &addresses.postalCode);
printf("Please enter the contact's city: ");
scanf("%s", &addresses.city);
// Contact Numbers Input:
printf("Do you want to enter a cell phone number? (y or no): ");
scanf("%s", &optionCell);
while (optionCell == 'y' || optionCell == 'Y') {
printf("Please enter the contact's cell phone number: ");
scanf(" %c", number.cell);
break;
}
printf("Do you want to enter a home phone number? (y or n): ");
scanf("%s", &optionHome);
while (optionHome == 'y' || optionHome == 'Y') {
printf("Please enter the contact's home phone number: ");
scanf(" %c", &number.home);
break;
}
printf("Do you want to enter a business phone number? (y or n): ");
scanf("%s", &optionBusiness);
while (optionBusiness == 'y' || optionBusiness == 'Y') {
printf("Please enter the contact's business phone number: ");
scanf(" %c", number.business);
break;
}
// Display Contact Summary Details
printf("Contact Details\n");
printf("---------------\n");
printf("Name Details\n");
printf("First name: ");
printf("%s", names.firstName);
printf("\nMiddle initials(s): ");
printf("%s", names.middleInitial);
printf("\nLast name: ");
printf("%s", names.lastName);
printf("\n\nAddress Details\n");
printf("Street number: ");
printf("%s", addresses.streetNumber);
printf("\nStreet name: ");
printf("%s", addresses.street);
printf("\nApartment: ");
printf("%s", addresses.apartmentNumber);
printf("\nPostal code: ");
printf("%s", addresses.postalCode);
printf("\nCity: ");
printf("%s", addresses.city);
printf("\n\nPhone Numbers: ");
printf("\nCell phone number: ");
printf("%s", number.cell);
printf("\nHome phone number: ");
printf("%s", number.home);
printf("\nBusiness phone number: ");
printf("%s", number.business);
// Display Completion Message
printf("\n\nStructure test for Name, Address, and Numbers Done!");
return 0;
}
And the structs in the header file:
// Structure type Name declaration
struct Name {
char firstName[31];
char middleInitial[7];
char lastName[36];
};
// Structure type Address declaration
// Place your code here...
struct Address {
char streetNumber;
char street[41];
char apartmentNumber;
char postalCode[8];
char city[41];
};
// Structure type Numbers declaration
// Place your code here...
struct Numbers {
char cell[21];
char home[21];
char business[21];
};
My program reaches the point of printing out "Street number: " then stops working. It is a windows error window that shows up, not a compiler window.

Answer 1

My program reaches the point of printing out "Street number: " then
stops working.
Take a look at:
struct Address {
char streetNumber; // declared as character!
char street[41];
char apartmentNumber; // character
char postalCode[8];
char city[41];
};
char optionName;
char optionAddress;
char optionCell;
char optionHome;
char optionBusiness;
Later on you try to read the values to the characters:
scanf("%s", &optionName);
scanf("%s", &optionAddress);
scanf("%s", &optionCell);
scanf("%s", &optionHome);
scanf("%s", &optionBusiness);
scanf("%s", &addresses.streetNumber); // <-------------- string read
using string format %s. That invokes UB since you are reading at least 2 bytes. "y" is a string with string null terminator '\0'. That extra byte overwrites the memory location.
Change declarations of variables to strings or reading format to character read as you already do here:
scanf(" %c", &addresses.apartmentNumber);

Answer 2

scanf("%s", &optionName);
This invites undefined behavior which could lead to run time error you are getting as optionName is char one byte and scanf() with %s will try to write '\0' which will surely go beyond bounds