code refactoring

src/app/models/project.model.ts

@@ -2,7 +2,8 @@ export interface IProject{
     projectId: number;
     name: string;
     description: string;
-    categories: string[];
+    categories: string;
+    categoryList: string[];
     roles: string[];
     responsibilities: string[];
     technologiesUsed: string[];

src/app/projects/projects.component.ts

@@ -38,7 +38,7 @@ categoryClicked: boolean = false;
       ? this.model.projects
       : this.model.projects.filter(
         (project: IProject) => {
-          return project.categories.includes(category)
+          return project.categoryList.includes(category)
         });
   }
 }