Implement task #30 - Task 880 from leetcode - Decoded String at Index

[brian-ai-assistant-dev[bot]]

Create TypeScript project

## Create TypeScript project

Initialize a TypeScript project for implementing the Decoded String at Index task from LeetCode and set up the necessary project structure.```

### Implement string decoding function

Implement string decoding function

### Write test cases using Jest

I have created a test suite using Jest to validate the correctness of the implementation of the Decoded String at Index function. I have written test cases for various scenarios to cover different edge cases and ensure that the function behaves as expected.

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