fix: Correct typo in ExponentalSearch.java filename

[imprince26]

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There is a typo in the file name for the Exponential Search algorithm.

Current file name: ExponentalSearch.java
Correct file name: ExponentialSearch.java

The corresponding test file, ExponentialSearchTest.java, is named correctly. This inconsistency should be fixed to improve the project's clarity and maintainability.

To Reproduce:

1. Navigate to src/main/java/com/thealgorithms/searches/.
2. Observe the file named ExponentalSearch.java.

Expected Behavior:
The file should be named ExponentialSearch.java.

Additional information

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