All notable changes and bug fixing to this project will be documented in this file.

-In buggy.cxx "word" struct, the member variable "count" is not given initial value, count should set as zero in constructor.
-In buggy.cxx line 40 and 42, s_word is assigned as zero at first element, so we cannot compare it with "end".
-In buggy.cxx line 52, found is changed to true when it found the word in the list, but "found" cannot change to false again.
-In buggy.cxx line 84, s_word would write and read at the same time, if there is no lock to protect it.
-In buggy.cxx line 115, "found" cannot be false again if it become true.

-In new main.cpp, Word is changed from struct to class, and data and count are set as private for protecting.\

-Because in buggy.cxx line85 there is a while-loop waiting for another thread to consume is not efficient and waste cpu, in main.cpp the wordbuffer is added for storing the words in a queue.
Then, condition variable and mutex are used for checking it's the right time to push a new word or consume a new word from the queue.\

-And in main.cpp reader class, there is a map to store words and their count. There are two reasons for using std::map.
First, when searching the words in buggy.cxx line 47 and line 111 by a for-loop is not efficient because complexity is O(n), and searing in std::map is O(logN).
Second, it sort alphabetically automatically in std::map, so sorting is not necessary before lookupwords.

-In buggy.cxx line 78, std::gets was deprecated in C++11 and removed from C++14, so std::getline is used in main.cpp.

-Finally, in buggy.cxx line 21-23, it's not safe and efficient to memory to use static global variables, so in main.cpp there is no static global variables.