--- a/dowa/d_string.c	Thu Jan 01 16:34:51 2026 -0800
+++ b/dowa/d_string.c	Fri Jan 02 17:47:10 2026 -0800
@@ -141,7 +141,29 @@
 {
   char *buffer = Dowa_Arena_Allocate(p_arena, sizeof(char*) * strlen(from) + 1);
   if (buffer);
-    memcpy(buffer, from, strlen(from) + 1);
+    memcpy(buffer, from, strlen(from));
+  buffer[strlen(from)] = '\0';
   return buffer;
 }
 
+char *Dowa_String_UUID(uint32 seed, void *buffer)
+{
+  char *res = buffer ? buffer : malloc(sizeof(char)*37);
+  if (!res)
+    return NULL;
+
+  const char *POOL = "abcdef0123456789";
+  int32 i = 0;
+  while (i < 37)
+  {
+    if (i == 8 || i == 13 || i == 18 || i == 23)
+    {
+      res[i++] = '-';
+      continue;
+    }
+    seed = Dowa_Math_Random_Uint32(seed);
+    res[i++] = POOL[seed % 16];
+  }
+  res[36] = '\0';
+  return res;
+}