add 3_4
Merge branch 'master' of https://github.com/marozau/cpp_craft_0314
add 3_4 and 3_5
Update small_buffer.cpp
Update small_buffer.h
Update 3_5.cpp
Update 3_4.cpp
Update trades_filter.cpp
Update trades_filter.h
Merge branch 'master' of https://github.com/marozau/cpp_craft_0314
Merge branch 'master' of https://github.com/TereschenkovaEugeniya/cpp_craft_0314
Merge branch 'master' of https://github.com/marozau/cpp_craft_0314
Merge branch 'homework_4'
Merge branch 'master' of https://github.com/marozau/cpp_craft_0314
homework 3 ( edit 3_4, 3_5 and add 3_6)
Merge pull request #276 from TereschenkovaEugeniya/master

homework 3