fix: `heap-buffer-overflow` in `run_length_encoding.c`

[vil02]

Description of Change

Running run_length_encoding.c leads to heap-buffer-overflow. The encoded is one too short. Moreover, there is an error in this test case: https://github.com/TheAlgorithms/C/blob/e5dad3fa8def3726ec850ca66a7f51521f8ad393/misc/run_length_encoding.c#L77 Note that the last character of the output of the function run_length_encode has to be the same as the last character of the input.

This PR fixes the mentioned issues and adds new test cases.

References

Checklist

• [x] Added description of change
• [x] Added file name matches File name guidelines
• [x] Added tests and example, test must pass
• [x] Relevant documentation/comments is changed or added
• [x] PR title follows semantic commit guidelines
• [x] Search previous suggestions before making a new one, as yours may be a duplicate.
• [x] I acknowledge that all my contributions will be made under the project's license.

Notes:

This PR fixes the heap-buffer-overflow in run_length_encoding.c.

[github-actions[bot]]

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[vil02]

@Panquesito7, @tjgurwara99, @alexpantyukhin could some of you please add a dont-close or approved label?