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Counting Duplicates/main.cpp

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+#include <algorithm>
+#include <cstddef>
+#include <string>
+#include <iostream>
+#include <map>
+
+size_t duplicateCount(const std::string& in); // helper for tests
+
+std::string toLower(const char* input){
+    std::string temp = input;
+    std::transform(temp.begin(), temp.end(), temp.begin(), ::tolower);
+    return temp;
+}
+
+size_t duplicateCount(const char* in)
+{
+    // Convert to lower chars
+    std::string input = toLower(in);
+
+    // Start counting for every char
+    std::map<char, int> my_map;
+    for(auto character: input){
+        auto it = my_map.find(character);
+        if(it != my_map.end()){
+            it->second += 1;
+        } else {
+            my_map[character] = 1;
+        }
+    }
+
+    // Count how often we have a value higher than 1
+    int count = 0;
+    for(auto it: my_map){
+        if(it.second > 1)
+            count++;
+    }
+    return count;
+}
+
+int main(){
+    std::cout << duplicateCount("TESTtest");
+}