fix #6

src/functions.ts

@@ -13,15 +13,17 @@ export function dmSlice(raw: string): string[] {
     if (txt.length <= 2000) {
       return {
         front: txt,
-        end: "",
+        end: null,
       };
     }
     let front = txt.slice(0, 2000);
     let end = txt.slice(2000, txt.length);
     if (end) {
-      let toLast = front.slice(front.lastIndexOf("\n"), -1);
+      let toLastNextLine =
+        "ㅤ" /* 공백문자 */ +
+        front.slice(front.lastIndexOf("\n"), front.length);
       front = front.slice(0, front.lastIndexOf("\n"));
-      end = toLast + end;
+      end = toLastNextLine + end;
     }
     return { front, end };
   }