[Snippets] Added a few bit-manipulation snippets in C

[aelshinawy]

Description

I added a few essential bit-manipulation snippets in C

1. Get i-th bit:  Get the i-th bit of a number
2. Set i-th bit:  Set the i-th bit of a number and returns the resulting number
3. Clear i-th bit:  Clear the ith bit of a number and returns the resulting number
4. Toggle i-th bit:  Toggle the i-th bit of a number and returns the resulting number
5. Count set bits:  Counts the number of set bits in an int
6. Is Odd:  Check if a number is odd
7. Swap Numbers:  Swap two numbers without a temporary variable

Type of Change

• ✨ New snippet
• 🛠 Improvement to an existing snippet
• 🐞 Bug fix
• 📖 Documentation update
• 🔧 Other (please describe):

Checklist

• I have tested my code and verified it works as expected.
• My code follows the style and contribution guidelines of this project.
• Comments are added where necessary for clarity.
• Documentation has been updated (if applicable).
• There are no new warnings or errors from my changes.

Related Issues

Closes #

Additional Context

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