From 77d72f840160095a28d204deda81cc26eda645f7 Mon Sep 17 00:00:00 2001
From: Bruno BELANYI <bruno@belanyi.fr>
Date: Mon, 21 Nov 2022 16:37:23 +0100
Subject: [PATCH] c: ex1: add solution

---
 c/ex1.c | 26 ++++++++++++++++++++++++++
 1 file changed, 26 insertions(+)
 create mode 100644 c/ex1.c

diff --git a/c/ex1.c b/c/ex1.c
new file mode 100644
index 0000000..c4ed9b5
--- /dev/null
+++ b/c/ex1.c
@@ -0,0 +1,26 @@
+#include <stdbool.h>
+#include <stddef.h>
+
+struct node_t {
+    unsigned v;
+    struct node_t* next;
+};
+
+struct node_t* even_nodes(struct node_t** list) {
+    struct node_t* res = NULL;
+
+    while (true) {
+        struct node_t* next = (*list)->next;
+
+        if ((*list)->v % 2 == 0) {
+            // Pop element from the list, add it to head of the other
+            (*list)->next = res;
+            res = *list;
+        }
+
+        *list = next;
+    }
+
+    // NOTE: this is in reverse order from the input list
+    return res;
+}