doc: update example

examples/simple_prompt.cc

@@ -1,22 +1,15 @@
 #include "qupp/prompt/prompt.h"
 
-#include <chrono>
-#include <iostream>
-#include <thread>
-
-void display_prompt() { std::cout << "Prompt from qupp!" << std::endl; }
-
-void move_cursor_down(int n) { std::cout << "\033[" << n << "B" << std::flush; }
-
-void move_cursor_up(int n) { std::cout << "\033[" << n << "A" << std::flush; }
+#include <iostream> // std::cout, std::endl
 
 int main() {
-
-  display_prompt();
-  move_cursor_down(1);
-  std::this_thread::sleep_for(std::chrono::seconds(1));
-  move_cursor_up(1);
-  std::this_thread::sleep_for(std::chrono::seconds(1));
+  qupp::prompt::Prompt prompt;
+  auto result = prompt.ask_for_input("This is a question:");
+  if (result.has_value()) {
+    std::cout << "You answered: " << result.value() << std::endl;
+  } else {
+    std::cout << "You did not answer." << std::endl;
+  }
 
   return 0;
 }

src/io/unix/io.cc

@@ -8,7 +8,9 @@ Terminal &Terminal::get_instance() {
   return instance;
 }
 
-void Terminal::print(const std::string &message) { std::cout << message; }
+void Terminal::print(const std::string &message) {
+  std::cout << message << std::endl;
+}
 
 std::string Terminal::read() {
   std::string input;