#include <iostream>
#include <vector>
#include <string>
#include <algorithm>
#include <cstddef>
 
int main()
{
	std::string myString = "This is \n a test. Let's go on. \n Yeah.";
	std::vector<std::string> vec;
 
	std::size_t start_pos = 0;
	std::size_t end_pos = 0;
	while ((end_pos = myString.find("\n", end_pos)) != std::string::npos)
	{
		vec.emplace_back(myString.substr(start_pos, end_pos - start_pos));
		start_pos = end_pos + 1;
		end_pos += 2;
	}
	vec.emplace_back(myString.substr(start_pos, myString.size() - start_pos)); // last substring
 
	for(const auto& it: vec) std::cout << it << "\n";
}
 

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