feature: implement extract names from json function

Author: Eric-Zhang-Developer

src/lib/extractNamesFromJson.ts

@@ -0,0 +1,19 @@
+// The reason for these interfaces is so that typescript neatly throws an error when a user 
+// adds a json that is not a followers.json or following.json format 
+
+interface ExpectedJSON {
+  title: string;
+  media_list_data: unknown[];
+  string_list_data: stringListData[];
+}
+
+interface stringListData{
+  href: string;
+  value: string;
+  timestamp: number;
+}
+
+export default function ExtractNamesFromJson(json: ExpectedJSON[]) {
+  const usernames = json.map(user => user.string_list_data[0].value);
+  return usernames;
+}