See attached images.Please help - C++ **Case Insensitive String Comparison**You can use the following functions to do case insensitive string comparison. Place them in your functions file and include appropriate prototypes in your header file.```cpp#include #include string stringToLower(string s) { string result = ""; for (int i = 0; i < s.length(); i++) result += tolower(s[i]); return result;}bool isEqual(string s1, string s2) { return stringToLower(s1) == stringToLower(s2);}bool isGreater(string s1, string s2) { return stringToLower(s1) > stringToLower(s2);}```### Explanation:- **Function `stringToLower`**: - Takes a string `s` as input. - Converts each character to lowercase using `tolower()`. - Returns the converted lowercase string.- **Function `isEqual`**: - Takes two strings `s1` and `s2`. - Compares them in a case insensitive manner using `stringToLower`. - Returns `true` if they are equal, otherwise returns `false`.- **Function `isGreater`**: - Takes two strings `s1` and `s2`. - Converts both strings to lowercase and checks if `s1` is greater than `s2`. - Returns `true` if `s1` is lexicographically greater, otherwise returns `false`. **Educational Webpage Content**---### Creating a Contact Information ApplicationThis guide will assist you in building a small application to manage contact information for multiple individuals. The program will maintain the following data for each person in your contact list: name, phone number, and email address. The list can store up to 100 people, utilizing an array of structs to hold these three attributes per contact.#### Application Main Menu- **A** - Add Person- **D** - Delete Person- **F** - Find and Display Person- **L** - List All People- **S** - Save List- **E** - Exit**Enter Choice:**Your application should display this menu continually and execute the selected option until "E" is chosen. There is no need to clear the screen between actions. Users can enter menu choices in upper or lower case.#### Options Explained:**Add Person:**- Prompt the user to enter a name, phone number, and email.- Ensure the phone number is a string containing only valid characters and verify its validity.- Validate email format, ensuring it contains "@" followed by a period.**Delete Person:**- Reads a name from the user, locates it in the array, and deletes the corresponding data.- Provide an error message if the person doesn't exist.- Ensure case-insensitive comparisons.**Find and Display a Person:**- Reads a name and displays the corresponding information if found.- Notify the user if the person is not on the list.- Utilize case-insensitive searches.**List All People:**- Display all contacts sorted by last name.- Implement case-insensitive bubble sort for sorting.**Save the List:**- Save the list to a file named "contacts.txt". Do not allow user modification of this file directly.- Format each contact’s data as `lastname,firstname,phone,email`.#### Implementation Considerations:- Include at least one function for every Main Menu option.- Duplicate names are not allowed.- All data modifications occur in-memory and are only written to the file upon saving.- Use functions for case-insensitive string comparisons.- Automatically read and populate the array from "contacts.txt" at startup.**Technical Note:**- Refer to your textbook (p. 548-549) for using the `isdigit` library function for phone number validation.This project provides a framework for handling basic contact information through a simple user interface

It is defined as a general purpose programming language. It is object oriented and has generic…

You can use the following functions to do case insensitive string comparison. Place them in your functions file and include appropriate prototypes in your header file. #include #include string stringToLower(string s) { string result = ""; for (int i = 0; i < s.length(); i++) result += tolower(s[i]);

You can use the following functions to do case insensitive string comparison. Place them in your functions file and include appropriate prototypes in your header file. #include #include string stringToLower(string s) { string result = ""; for (int i = 0; i < s.length(); i++) result += tolower(s[i]);

Computer Networking: A Top-Down Approach (7th Edition)

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ISBN:9780133594140

Author:James Kurose, Keith Ross

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Chapter1: Computer Networks And The Internet

Section: Chapter Questions

Problem R1RQ: What is the difference between a host and an end system? List several different types of end...

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Question

See attached images.

Please help - C++

**Case Insensitive String Comparison**

You can use the following functions to do case insensitive string comparison. Place them in your functions file and include appropriate prototypes in your header file.

```cpp
#include <string>
#include <cstdlib>

string stringToLower(string s)
{
string result = "";
for (int i = 0; i < s.length(); i++)
result += tolower(s[i]);
return result;
}

bool isEqual(string s1, string s2)
{
return stringToLower(s1) == stringToLower(s2);
}

bool isGreater(string s1, string s2)
{
return stringToLower(s1) > stringToLower(s2);
}
```

### Explanation:

- **Function `stringToLower`**:
- Takes a string `s` as input.
- Converts each character to lowercase using `tolower()`.
- Returns the converted lowercase string.

- **Function `isEqual`**:
- Takes two strings `s1` and `s2`.
- Compares them in a case insensitive manner using `stringToLower`.
- Returns `true` if they are equal, otherwise returns `false`.

- **Function `isGreater`**:
- Takes two strings `s1` and `s2`.
- Converts both strings to lowercase and checks if `s1` is greater than `s2`.
- Returns `true` if `s1` is lexicographically greater, otherwise returns `false`.

**Educational Webpage Content**

---

### Creating a Contact Information Application

This guide will assist you in building a small application to manage contact information for multiple individuals. The program will maintain the following data for each person in your contact list: name, phone number, and email address. The list can store up to 100 people, utilizing an array of structs to hold these three attributes per contact.

#### Application Main Menu
- **A** - Add Person
- **D** - Delete Person
- **F** - Find and Display Person
- **L** - List All People
- **S** - Save List
- **E** - Exit

**Enter Choice:**

Your application should display this menu continually and execute the selected option until "E" is chosen. There is no need to clear the screen between actions. Users can enter menu choices in upper or lower case.

#### Options Explained:

**Add Person:**
- Prompt the user to enter a name, phone number, and email.
- Ensure the phone number is a string containing only valid characters and verify its validity.
- Validate email format, ensuring it contains "@" followed by a period.

**Delete Person:**
- Reads a name from the user, locates it in the array, and deletes the corresponding data.
- Provide an error message if the person doesn't exist.
- Ensure case-insensitive comparisons.

**Find and Display a Person:**
- Reads a name and displays the corresponding information if found.
- Notify the user if the person is not on the list.
- Utilize case-insensitive searches.

**List All People:**
- Display all contacts sorted by last name.
- Implement case-insensitive bubble sort for sorting.

**Save the List:**
- Save the list to a file named "contacts.txt". Do not allow user modification of this file directly.
- Format each contact’s data as `lastname,firstname,phone,email`.

#### Implementation Considerations:
- Include at least one function for every Main Menu option.
- Duplicate names are not allowed.
- All data modifications occur in-memory and are only written to the file upon saving.
- Use functions for case-insensitive string comparisons.
- Automatically read and populate the array from "contacts.txt" at startup.

**Technical Note:**
- Refer to your textbook (p. 548-549) for using the `isdigit` library function for phone number validation.

This project provides a framework for handling basic contact information through a simple user interface

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