function to invert the case of each character in a string

[swanandapps]

What is needed:

Function to invert the case of each character in a string.

Where to Code:

Find the Contribution Station in lib/textCaseManipulation.js.

Contribution Steps:

1. Create a development branch out of this issue. (Visible on the right column of the issue)
2. Code your function in that branch.
3. Raise a Pull Request to merge that branch into the main branch.

For more clarity, follow the visual guide in CONTRIBUTE.md.

[VinayakaHegade]

@swanandapps i would like to work on this issue.
Can you assign it to me?.

[ssk090]

Hey @swanandapps, please check this pull request for the same: #28

[subham-dev-hash]

I want to contribute