diff --git a/heap.c b/heap.c
new file mode 100644
index 0000000..7dfb0d7
--- /dev/null
+++ b/heap.c
@@ -0,0 +1,15 @@
+struct Heap_
+{
+    int size;
+    int (*compare)(const void *key1, const void *key2);
+    void (*destory)(void *data);
+    void **tree;
+};
+typedef struct Heap_ Heap;
+
+void heap_init(Heap *heap, int (*compare)(const void *key1, const void *key2), void (*destory)(void *data));
+void heap_destory(Heap *heap);
+int heap_insert(Heap *heap, const void *data);
+int heap_extract(Heap *heap, void **data);
+
+#define HEAP_SIZE(heap) ((heap)->size)
diff --git a/insertion_sort.c b/insertion_sort.c
new file mode 100644
index 0000000..963a1de
--- /dev/null
+++ b/insertion_sort.c
@@ -0,0 +1,43 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+int issort(void *data, int size, int esize, int (*compare)(const void *key1, const void *key2))
+{
+    char *a = data;
+    void *key;
+    int i,j;
+
+    if (NULL == (key = (char *)malloc(esize))) {
+        return -1;
+    }
+
+    for (j = 1; j < size; j++) {
+        memcpy(key, &a[j * esize], esize);
+        i = j - 1;
+
+        while (i >=0 && compare(&a[i * esize], key) > 0) {
+            memcpy(&a[(i + 1) * esize], &a[i * esize], esize);
+            i--;
+        }
+
+        memcpy(&a[(i + 1) * esize], key, esize);
+    }
+
+    free(key);
+
+    return 0;
+}
+
+int main()
+{
+    char *str = "zyxkjhaop";
+
+    printf("original:str = %s", str);
+
+    issort(str, 9, sizeof(char), strcmp);
+
+    printf("changed:str = %s", str);
+    
+    return 0;
+}