From c1bfc98c34a6729896ddc0ebc88476c4568ed3bd Mon Sep 17 00:00:00 2001
From: boboboba <95755392+boboboba@users.noreply.github.com>
Date: Wed, 29 Oct 2025 01:37:03 +0500
Subject: [PATCH] hide-secret

---
 hide-secret.cpp | 56 +++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 56 insertions(+)
 create mode 100644 hide-secret.cpp

diff --git a/hide-secret.cpp b/hide-secret.cpp
new file mode 100644
index 0000000..2255b10
--- /dev/null
+++ b/hide-secret.cpp
@@ -0,0 +1,56 @@
+#include <cstring>
+
+void hide_secret(char* const text, const char* const secret)
+{
+    if (text == nullptr || secret == nullptr)
+        return;
+    int secretLength = strlen(secret);
+    if ( secretLength == 0)
+        return;
+    for (int i = 0; text[i] != '\0'; i++)
+    {
+        bool matched = true;
+        bool needEnd = false;
+        for (int j = i; j - i < secretLength; j++)
+        {
+            if (text[j] == '\0')
+            {
+                needEnd = true;
+            }
+            if (text[j] != secret[j - i])
+            {
+                matched = false;
+                break;
+            }
+        }
+
+        if (!matched)
+        {
+            continue;
+        }
+        if (needEnd)
+        {
+            break;
+        }
+        text[i] = '\x01';
+    }
+
+    int lastStart = -1;
+    for (int i = 0; text[i] != '\0'; i++)
+    {
+        if (text[i] == '\x01')
+        {
+            lastStart = i;
+        }
+
+        if (lastStart == -1)
+        {
+            continue;
+        }
+
+        if (i - lastStart < secretLength)
+        {
+            text[i] = 'x';
+        }
+    }
+}