Develop a program to perform file operations such as writing. appending, and reading from a text file. The program should first write a predefined string to a file, then append a userprovided string to the same file, and finally read and print the contents of the file.

Writing to a File:

The program should create or overwrite a file named source.txt$.$

It should write the string "Hello World" to the file.

Appending to a File:

The program should prompt the user to input a string.

This user$-$provided string should be appended to the existing contents of source.txt$.$

Reading from a File:

After appending the string, the program should read all contents of source.txt$.$

It should print the contents of the file line by line to the console.

Instructions:

The solution code should have its class name as AppendToFile.

The main logic for the solution should be written inside AppendToFile class.

Input format :

The input consists of a string.

Output format:

The output prints the string "Hello World" with the appended string.

Refer to the sample output for formatting specifications.

Sample test cases :

Input $1$:

Live Like Laugh

Input $2$:

Alice in Wonderland

Output $1$ :

Hello World

Live Lile Laugh

Output $2$:

Hello World

Alice in Wonderland

Input $3$ :

Output $3$ :

Actions Speak Louder Than $W$ Hello World

Actions Speak Louder Than WI