feat(codes/c): add C include/ codes and modify exist C codes

codes/c/include/list_node.h

@@ -0,0 +1,72 @@
+/**
+ * File: list_node.h
+ * Created Time: 2023-01-09
+ * Author: Reanon (793584285@qq.com)
+ */
+#ifndef LIST_NODE_H
+#define LIST_NODE_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+ * @brief Definition for a singly-linked list node
+ *
+ */
+struct ListNode {
+    int val;               // 结点值
+    struct ListNode *next; // 指向下一结点的指针（引用）
+};
+
+// typedef 为 C 语言的关键字，作用是为一种数据类型定义一个新名字
+typedef struct ListNode ListNode;
+
+ListNode *NewListNode(int val) {
+    ListNode *node, *next;
+    node = (ListNode *) malloc(sizeof(ListNode));
+    node->val = val;
+    node->next = NULL;
+    return node;
+}
+
+/**
+ * @brief Generate a linked list with a vector
+ *
+ * @param list
+ * @return ListNode*
+ */
+
+ListNode *ArrayToLinkedList(const int *arr, size_t size) {
+    if (size <= 0) {
+        return NULL;
+    }
+
+    ListNode *dummy = NewListNode(0);
+    ListNode *node = dummy;
+    for (int i = 0; i < size; i++) {
+        node->next = NewListNode(arr[i]);
+        node = node->next;
+    }
+    return dummy->next;
+}
+
+/**
+ * @brief Get a list node with specific value from a linked list
+ *
+ * @param head
+ * @param val
+ * @return ListNode*
+ */
+ListNode *GetListNode(ListNode *head, int val) {
+    while (head != NULL && head->val != val) {
+        head = head->next;
+    }
+    return head;
+}
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif // LIST_NODE_H