Add uc_str_append_all function

include/ucore/strvec.h

@@ -83,6 +83,18 @@ void uc_strv_clear(struct UCStrv *strv);
  */
 void uc_strv_destroy(struct UCStrv *strv);
 
+/**
+ * Append all the elments from b to a
+ * If copy is 1, the appended elements will be copied when appended
+ *
+ * @param a destination UCStrv
+ * @param b source UCStrv
+ * @param copy 1 for making a copy of the string when appending it
+ *        0 to just append the same pointer in b to a
+ * @return 0 on success, != 0 if appending/allocation fails
+ */
+int uc_strv_append_all(struct UCStrv *a, struct UCStrv *b, int copy);
+
 #ifdef __cplusplus
 }
 #endif