remove useless code
Add more tests.

The original task require to be able to cut any substring, not
just 'debug' so a new test case added.
Also more long tests were added for convinience, they tests
long and short needle and different places for cut word.
Merge pull request #13 from lesteriv/patch-3

remove useless code
Merge pull request #15 from qnikst/more-tests

Add more tests.
new anonymous solution
important change: count minimal time for each pass
minor cleanup
Introduce 2 new solutions.

Solutions are quite strange as it's attempt to reduce
amount of work in memmove loop. Works nicely only on
linux or with _GNU_SOURCE.
bump
faster remove_word from wota
fix compare to string, indent