Java 17: Start using text blocks

[iluwatar]

Available since Java 15, we can now use the text blocks feature. See the tutorial at https://www.baeldung.com/java-text-blocks

Acceptance criteria

• Text blocks have been applied throughout the repository to improve readability

[Damzxyno]

Hi @iluwatar !
Can you assign me this issue? This task will get me acquinted with the project as a whole.

[amol-can]

Hey is this issue still in progress, @iluwatar can I help with it?

[iluwatar]

@Damzxyno are you still working on it?

[CoderRahul01]

@Damzxyno Hey are you working on it ..... Can I give you a help

[iluwatar]

@Damzxyno is not responding, so I guess we can reassign the issue. Go ahead @CoderRahul01