Got these problems in HACKERRANK challenge

1.FirstIndex of Character

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Given a string and a character. Find the first index of the character in the string

Example:

If you are given the following input data:
string = "hi, this is bitgo test" character = "t"

The output will be:
4

2. What happens when you type a url in the browser and hit enter

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3. Testing

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Write unit and integration test cases for transaction api.