Testbranch1

Summary by Bito

This PR introduces four new classes (AirlineProblem, BinaryConverter, FreqTableExampleOriginal, and IntListVer2) to improve functionality. The changes address string concatenation issues in AirlineProblem.java, enhancing code clarity and creating a more consistent implementation across the new components.

Unit tests added: False

Estimated effort to review (1-5, lower is better): 1