Trie Code

create d branch

implement lower_bound, upper_bound and find

implement postfix increment operator

Remove copy constructor and copy assignment operator from TrieIterator because since we don't manage resources we don't have to implement it

Move == and != operator from class friends to members

divide Trie.cpp into Main.cpp and Trie.hpp and remove "using namespace std" from the header file

divide Trie.cpp into Main.cpp and Trie.hpp and remove "using namespace std" from the header file

Add first version

Add initial directories