refactor: use shared hackathon user helper

Author: luojiyin1987

components/Activity/Hackathon/constant.ts

@@ -1,5 +1,3 @@
-import { TableCellUser } from 'mobx-lark';
-
 import { Activity, ActivityModel } from '../../../models/Activity';
 import { Agenda, Organization, Person, Prize, Project, Template } from '../../../models/Hackathon';
 import { i18n } from '../../../models/Translation';
@@ -13,6 +11,7 @@ import {
   formatPeriod,
   normalizeAgendaType,
   previewText,
+  userOf,
 } from './utility';
 
 export const RequiredTableKeys = [
@@ -336,7 +335,7 @@ export const buildProjectItems = (
   { projects, activity }: { projects: Project[]; activity: Activity },
 ) =>
   projects.map(({ id, name, score, summary, createdBy, members }) => {
-    const creator = createdBy as TableCellUser | undefined;
+    const creator = userOf(createdBy);
     const scoreText = score === null || score === undefined || score === '' ? '—' : `${score}`;
 
     return {