Prepare index of lines in file contents ASCII symbols.
After preparing user can find line in index.
Index will be stored in simple not compressed trie.

Testing:
1) Unpack tests in 'test' directory (tar -xzvf tests.tar.gz), or prepare your test file.
2) Build by command 'make'
3) Run tests by command 'make test'

Running:
1) Run indexer by command './solution your_text_file.txt'
2) Input any line from 'your_text_file.txt'

Example:
./solution tests/lord.txt

and input in cin >> "The ring!" exclaimed Frodo. "Has he left me that? I wonder why. Still, it may be useful."