Missing cstring include

[oysstu]

osrf_testing_tools_cpp/osrf_testing_tools_cpp/src/memory_tools/is_working.cpp

Lines 37 to 38 in 57f6194

	memcpy(some_memory, str.c_str(), str.length());
	memcpy((void *)side_effect, some_memory, str.length());

The use of memcpy requires including cstring. Fails to compile on gcc 12.1