added a google case problem in c++

[Amanjakhetiya]

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Description

Please describe what changes you have made.

For Example:

• Added a file(s) named '...' that implements '...'.

• Changed the algorithm for performance/readablity/bugs.

• Added documentation to the algorithm added a google case problem which comes under the string manipulation.It is a problrm which need to be added in the related folder to make it more enriched and vived for a learner especially the begineers.

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Types of changes

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• [ ] Bug fix (change which fixes an issue with the algorithm)

• [ ] New Algorithm (non-breaking change which adds functionality)

• [ ] Documentation

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• [ ] My code follows the code style of this project.

• [ ] My change requires a change to the documentation.

• [ ] I have updated the documentation accordingly.

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