added logout functions

MALUserFunctions.go

@@ -256,3 +256,18 @@ func (a *App) GetMyAnimeListLoggedInUser() MyAnimeListUser {
 
 	return user
 }
+
+func (a *App) LogoutMyAnimeList() string {
+	if (MyAnimeListJWT{} != myAnimeListJwt) {
+		err := myAnimeListRing.Remove("MyAnimeListTokenType")
+		err = myAnimeListRing.Remove("MyAnimeListExpiresIn")
+		err = myAnimeListRing.Remove("MyAnimeListAccessToken")
+		err = myAnimeListRing.Remove("MyAnimeListRefreshToken")
+
+		if err != nil {
+			fmt.Println("MAL Logout Failed", err)
+		}
+	}
+
+	return "MAL Logged Out Successfully"
+}