fix leak str("")
Merge branch 'task' of https://github.com/aLekSer/cpp_craft_1013 into task

Conflicts:
	solutions/aleks_apalikov/Craft_7/sources/multicast_communication/minute_calculator.cpp
	solutions/aleks_apalikov/Craft_7/sources/multicast_communication/minute_calculator.h
	solutions/aleks_apalikov/Craft_7/tests/multicast_communication_tests/minute_calculator_test.cpp