Problem: Imagine you're working on a machine learning project focused on building a system for image recognition. The goal is to create a system that, when presented with an image, can extract features from it and correctly identify the object in the picture. For example, if you feed an image of a ball into the system, it should analyze the features and recognize it as a ball.

Before the system can perform this task, it needs to be trained using training data, which involves generating features for training purposes. This process results in feature files containing features of an object along with a corresponding label $($e$.$g$.,$ ball, cat, dog, etc.$).$

To accomplish this, follow the steps below:

Develop a $CH+$ program that allows users to input lines containing comma$-$separated 'features and a label.$\text{'}$

Save the entered inputs into a file

Read the contents of the file to output the 'features and labels' lines.

Please make sure to structure your program as follows,

Your program should have a global variable called filename that will be accessed by any function in the program.

Your program should have a user$-$defined function called createFeatureFile that creates a feature file with the same name as the one entered by the user during the prompt.

Your program should have a user$-$defined function called saveToFile that will have the following two parameters:

a$.$ filename: A string representing the name of the file to which the data will be appended.

b$.$ data: A string representing the data that needs to be saved in the file.

Note: DO NOT write the code for file processing under "main function"

The main function will call the saveToFile function within a loop to continuously take user input and save it to the specified file.

Your program should have a user$-$defined function called readFromFile to read the data from the feature file having the following parameter:

a$.$ fileName: name of the file from which the data needs to be read.