Filesystem library
An important addition to the C++17 standard is the filesystem library. The filesystem library is based on boost::filesystem and enables us to work with paths, files and directories.
The current compilers (gcc 7.2. is used for this exercise) provide an implementation of the library in the std::experimental::filesystem namespace and the actual header is <experimental/filesystem>.
Implement a program that searchs in the 'data' directory of the current directory for all files which contain 'copy' in its content and copy them to a new folder 'data_new'.
#include <experimental/filesystem>
#include <iostream>
#include <string>
#include <vector>
#include <fstream>
namespace fs = std::experimental::filesystem;
using namespace std::string_literals;
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