Refactored the package names.
Wrote Assert part of test 'the factorial of 5 is 120 p20'.
Fixed Error: Created and implemented method factorial().
Added @annotation.tailrec.
Wrote the assert part of test 'the 7th fibonacci number is 13'.
Fixed Error: Implemented method fibonacci().
Tested the 3rd fibonacci number.
Wrote intention code of Assert part of test 'test higher-order function'.
Fixed Error: Created and implemented method formatResult().
Renamed test class names to reflecting the knowledge points.