[Sync Iteration] cpp/beer-song/1

solutions/cpp/beer-song/1/beer_song.cpp

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+#include "beer_song.h"
+#include <sstream>
+
+using namespace std;
+
+namespace beer_song {
+
+    string verse(int number) {
+        ostringstream ss;
+
+        switch (number) {
+            case 0:
+            ss << "No more bottles of beer on the wall, no more bottles of beer.\n"
+            << "Go to the store and buy some more, 99 bottles of beer on the wall.\n";
+            break;
+
+            case 1:
+            ss << "1 bottle of beer on the wall, 1 bottle of beer.\n"
+            << "Take it down and pass it around, no more bottles of beer on the wall.\n";
+            break;
+
+            case 2:
+            ss << "2 bottles of beer on the wall, 2 bottles of beer.\n"
+            << "Take one down and pass it around, 1 bottle of beer on the wall.\n";
+            break;
+
+            default:
+            ss << number << " bottles of beer on the wall, " << number << " bottles of beer.\n"
+            << "Take one down and pass it around, " << (number - 1) << " bottles of beer on the wall.\n";
+            break;
+        }
+
+        return ss.str();
+    }
+
+    string sing(int start, int end) {
+        ostringstream ss;
+
+        // La canción siempre va en cuenta regresiva
+        for (int i = start; i >= end; --i) {
+            ss << verse(i);
+            // Salto de linea entre versos
+            if (i > end) {
+                ss << "\n";
+            }
+        }
+
+        return ss.str();
+    }
+
+}

solutions/cpp/beer-song/1/beer_song.h

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+#pragma once
+#include <string>
+
+namespace beer_song {
+
+    // Genera un único verso específico (de 0 a 99)
+    std::string verse(int number);
+
+    // Genera una serie de versos desde un punto de inicio hasta un punto de fin
+    std::string sing(int start, int end = 0);
+
+}