task 3.
task 3.6.
fixed len in 2.4.
Merge branch 'develop'
Merge branch 'master' of https://github.com/sidorovis/cpp_craft_1013
added task 3.
task 3 fixed.
fixed output in 3.6.
Merge pull request #126 from fobostm/master

hometask 3 too many threads but, ok
it's better to check at least existence of such file