diff --git a/hide-secret.cpp b/hide-secret.cpp
new file mode 100644
index 0000000..342f829
--- /dev/null
+++ b/hide-secret.cpp
@@ -0,0 +1,56 @@
+int check_and_change(char* const text, const char* const secret,
+    const int shift)
+{
+    int i = 0;
+    while (secret[i] != '\0')
+    {
+        if (secret[i] != text[i + shift])
+        {
+            return shift;
+        }
+        i++;
+    }
+    const int secret_len = i;
+
+
+    i = 0;
+    while (i < secret_len && secret[i] != '\0')
+    {
+        text[i + shift] = 'x';
+        i++;
+        i = check_and_change(text, secret, i + shift) - shift;
+    }
+
+    return shift + i - 1;
+}
+
+int get_string_length(const char* const str)
+{
+    int i = 0;
+    while (str[i] != '\0')
+    {
+        i++;
+    }
+    return i;
+}
+
+void hide_secret(char* const text, const char* const secret)
+{
+    if (!text || !secret)
+    {
+        return;
+    }
+
+    const int text_len = get_string_length(text);
+    const int secret_len = get_string_length(secret);
+    if (text_len <= 0 || secret_len <= 0 || text_len < secret_len)
+    {
+        return;
+    }
+
+    int i = 0;
+    while (text[i] != '\0')
+    {
+        i = check_and_change(text, secret, i) + 1;
+    }
+}
\ No newline at end of file