diff --git a/helper.h b/helper.h
index be45469..3413c55 100644
--- a/helper.h
+++ b/helper.h
@@ -2,7 +2,7 @@
 * File          : helper.h
 * Authors       : Aoran Zeng <ccmywish@qq.com>
 * Created on    : <2023-08-28>
-* Last modified : <2023-08-29>
+* Last modified : <2023-08-30>
 *
 * helper:
 *
@@ -21,14 +21,52 @@
 
 #define Array_Size(x) (sizeof(x) / sizeof(x[0]))
 
-char*
+
+static inline void*
+xy_malloc0 (size_t size)
+{
+  void* ptr = malloc(size);
+  memset(ptr, 0, size);
+  return ptr;
+}
+
+
+static char*
 xy_strjoin (const char* str1, const char* str2)
 {
   size_t len  = strlen(str1);
   size_t size = len + strlen(str2) + 1;
-
   char* ret  = malloc(size);
   strcpy(ret, str1);
   strcpy(ret+len, str2);
   return ret;
 }
+
+
+static void
+xy_success (const char* str1)
+{
+  char color_fmt_str[] = "\033[32m%s\033[0m";
+  // -2 把中间%s减掉，-1 把末尾nul减掉
+  size_t len = sizeof(color_fmt_str) -2 -1;
+  char* buf = malloc(strlen(str1) + len + 1);
+
+  sprintf (buf, color_fmt_str, str1);
+  puts(buf);
+  free(buf);
+}
+
+
+static void
+xy_warn (const char* str1)
+{
+  // 注意，我们这里相比于xy_suceess()多了一个换行符
+  char color_fmt_str[] = "\033[33m%s\033[0m\n";
+  // -2 把中间%s减掉，-1 把末尾nul减掉
+  size_t len = sizeof(color_fmt_str) -2 -1;
+  char* buf = malloc(strlen(str1) + len + 1);
+
+  sprintf (buf, color_fmt_str, str1);
+  fprintf(stderr, buf);
+  free(buf);
+}