Added linear search and binary search in C language .

[Rishita489]

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Description

I have added Linear Search and Binary Search in C folder in classical_algorithms folder .

[Rishita489]

hey @larissalages , can you please review and merge my PR under Hacktoberfest 2022 .

[Rishita489]

Also can you please assign Hacktoberfest label to it .