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:

C/misc/run_length_encoding.c

Line 77 in e5dad3f

assert(!strcmp(test, "1l1i1d1j1h1v1i1p1d1u1r1e1v1b1e1i1r1b1g1i1p1e1a1h1a1p1o1e1u1h1w1a1i1p1e1f1u1p1w1i1e1o1f1bq"));

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

• Added description of change
• Added file name matches File name guidelines
• Added tests and example, test must pass
• Relevant documentation/comments is changed or added
• PR title follows semantic commit guidelines
• Search previous suggestions before making a new one, as yours may be a duplicate.
• 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]

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[vil02]

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