Reverse Lines in Place

Write a function void reverseLines(const string& filename) that reverses the order of the lines in a text file: the last line becomes the first, and so on.

Read every line with getline into a vector<string>, then reopen the file in ios::out | ios::trunc mode and write the lines back from last to first, each followed by a newline. A file with a single line stays the same.

The test creates the file, calls your function and prints every line of the file. For a file with the lines a, b, c it prints the output shown in Expected Output.

Do NOT write a main function.