Fix small spelling mistakes
Merge pull request #6 from tborisova/patch-1

Fix small spelling mistakes
Add test for SusiError.
Difference - expected output vs problem definition
Merge pull request #7 from yasvisu/patch-1

Difference - expected output vs problem definition
Fix interface checks

Added logical negation for Course and Student interface implementation checks.
Merge pull request #9 from yasvisu/patch-3

Fix interface checks
Remove Stringer tests with reflect.
Fix check for student and course data, instead of the pointers.
Add the broadcaster challenge
Add 3rd homework