From c9b6b9a5ca082fe7c1b6f58d7713f785a9eb6a5c Mon Sep 17 00:00:00 2001
From: Martial Simon <msimon_fr@hotmail.com>
Date: Mon, 15 Sep 2025 01:08:27 +0200
Subject: add: graphs et rushs

---
 graphs/piscine/palindrome/palindrome.c | 47 ++++++++++++++++++++++++++++++++++
 graphs/piscine/palindrome/palindrome.h |  6 +++++
 2 files changed, 53 insertions(+)
 create mode 100644 graphs/piscine/palindrome/palindrome.c
 create mode 100644 graphs/piscine/palindrome/palindrome.h

(limited to 'graphs/piscine/palindrome')

diff --git a/graphs/piscine/palindrome/palindrome.c b/graphs/piscine/palindrome/palindrome.c
new file mode 100644
index 0000000..2ecacfd
--- /dev/null
+++ b/graphs/piscine/palindrome/palindrome.c
@@ -0,0 +1,47 @@
+#include "palindrome.h"
+
+#include <stddef.h>
+
+int palindrome(const char *s)
+{
+    if (s == NULL)
+    {
+        return 0;
+    }
+
+    if (*s == '\0')
+    {
+        return 1;
+    }
+
+    const char *p = s;
+    while (*p)
+    {
+        p++;
+    }
+    p--;
+
+    while (p > s)
+    {
+        while ((*p < '0' || (*p > '9' && *p < 'A') || (*p > 'Z' && *p < 'a')
+                || *p > 'z')
+               && p > s)
+        {
+            p--;
+        }
+        while ((*s < '0' || (*s > '9' && *s < 'A') || (*s > 'Z' && *s < 'a')
+                || *s > 'z')
+               && p > s)
+        {
+            s++;
+        }
+        if (*p != *s)
+        {
+            return 0;
+        }
+        p--;
+        s++;
+    }
+
+    return 1;
+}
diff --git a/graphs/piscine/palindrome/palindrome.h b/graphs/piscine/palindrome/palindrome.h
new file mode 100644
index 0000000..8595911
--- /dev/null
+++ b/graphs/piscine/palindrome/palindrome.h
@@ -0,0 +1,6 @@
+#ifndef PALINDROME_H
+#define PALINDROME_H
+
+int palindrome(const char *s);
+
+#endif /* !PALINDROME_H */
-- 
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