Bug fixes and new game feature

[g-kabra]

I have added the mentioned fixes as per issue #23.

Changes I have implemented:

• [x] Fixed the double highlighting issue.
• [x] Added the new game feature.
• [x] Fixed regex to accept capital letter input as well.

Before:

After:

There have been some changes done by the formatting tool automatically, which makes the code more compliant to best practices.

[akshat-jn-crypto]

Also add your code snippet.

[g-kabra]

The changes have been implemented like this:

1) Double highlighting issue has been resolved by making a different function to mark it as correct/wrong-location.

2) New game feature has been implemented by using the startNewGame() function.

3) RegEx fix is as follows.