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diff --git a/challenge-001/paulo-custodio/cpp/ch-1.cpp b/challenge-001/paulo-custodio/cpp/ch-1.cpp
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+++ b/challenge-001/paulo-custodio/cpp/ch-1.cpp
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+/*
+Challenge 001
+
+Challenge #1
+Write a script to replace the character ‘e’ with ‘E’ in the string
+‘Perl Weekly Challenge’. Also print the number of times the character ‘e’
+is found in the string.
+*/
+
+#include <iostream>
+#include <string>
+
+int replace_e(std::string& text) {
+    int count = 0;
+    for (auto& c : text) {
+        if (c == 'e') {
+            c = 'E';
+            count++;
+        }
+    }
+    return count;
+}
+
+int main(int argc, char* argv[]) {
+    std::string text;
+    for (int i = 1; i < argc; i++) {
+        text += argv[i];
+        text += " ";
+    }
+    if (!text.empty())
+        text.pop_back();            // remove last space
+
+    std::cout << replace_e(text) << " " << text << std::endl;
+}