diff --git a/hide-secret.cpp b/hide-secret.cpp
new file mode 100755
index 0000000..ea09801
--- /dev/null
+++ b/hide-secret.cpp
@@ -0,0 +1,33 @@
+#include <iostream>
+#include <cstring>
+#include <vector>
+
+void hide_secret(char* const text, const char* const secret) {
+    if (!text || !secret) { return; }
+
+    const unsigned textlen = strlen(text);
+    const unsigned secretlen = strlen(secret);
+
+    if (textlen < 1 || secretlen < 1 || textlen < secretlen) { return; }
+
+    std::vector<size_t> indices;
+
+    for (size_t i = 0; i < textlen - secretlen + 1; i++) {
+        bool isSubstring = true;
+
+        for (size_t j = 0; j < secretlen; j++) {
+            if (text[i+j] != secret[j]) {
+                isSubstring = false;
+                break;
+            }
+        }
+
+        if (isSubstring) { indices.push_back(i); }
+    }
+
+    for (size_t index : indices) {
+        for (size_t j = 0; j < secretlen; j++) {
+            text[index + j] = 'x';
+        }
+    }
+}