完成了创建轨道函数

修复了query.c中错误的定义
添加了创建轨道的测试

src/query.c

@@ -3,6 +3,5 @@
 //
 #include "query.h"
 
-up_bus_t* up_queries = NULL;
-down_bus_t *down_queries = NULL;
+
 

src/rail.c

@@ -5,4 +5,38 @@ rail_node_t *rails = NULL;
 int add(int a, int b)
 {
     return a+ b;
+}
+
+rail_node_t *CreateRails(int length, int node_num)
+{
+    /**
+     * 表示轨道的头节点
+     */
+    rail_node_t *head = NULL;
+    rail_node_t *node = NULL;
+
+    head = (rail_node_t*) malloc(sizeof (rail_node_t));
+    head->id = 1;
+    head->last_node_distance = length;
+    head->next_node_distance = length;
+
+    node = head;
+    // 循环创建每一个节点
+    for(int i = 2; i <= node_num; i++)
+    {
+        rail_node_t *p = (rail_node_t*) malloc(sizeof (rail_node_t));
+
+        p->id = i;
+        p->last_node_distance = length;
+        p->next_node_distance = length;
+        p->last_node = node;
+        node->next_node = p;
+        node = p;
+    }
+
+    // 循环结束时node就是最后一个节点
+    node->next_node = head;
+    head->last_node = node;
+
+    return head;
 }