TheAlgorithms / C

* feat(ExponentialSearch): added C implementation of Exponential Search

* fix: typo

* refactor(ExponentialSearch): removed unused imports

* fix(Exponential Search): review fixes

* updating DIRECTORY.md

* refactor(ExponentialSearch): refactoring types

* fix(ExponentialSearch): fixes and added brief

* refactor(ExponentialSearch): added briefs

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