etl: iteration 1

cpp/etl/etl.cpp

@@ -0,0 +1,20 @@
+#include "etl.h"
+
+#include <cctype>
+
+namespace etl {
+
+using namespace std;
+
+new_score_t transform(const old_score_t &input)
+{
+    new_score_t result;
+
+    for (auto pair : input)
+        for (auto c : pair.second)
+            result[tolower(c)] = pair.first;
+
+    return result;
+}
+
+}

cpp/etl/etl.h

@@ -0,0 +1,15 @@
+#pragma once
+
+#define EXERCISM_RUN_ALL_TESTS
+
+#include <map>
+#include <vector>
+
+namespace etl {
+
+typedef std::map<int, std::vector<char>> old_score_t;
+typedef std::map<char, int>              new_score_t;
+
+new_score_t transform(const old_score_t&);
+
+}