private static String[] addContactToGroup(String[] tk)
{
if (tk.Length < 4)
{
return(str2arr("Missing arguments. Usage: addContactToGroup <contactID> <userID> <groupName>"));
}
var x = sm.addContactsToGroup(new List <Contact>()
{
sm.getEntityByID <Contact>(int.Parse(tk[1]))
}, sm.getGroupByUser(int.Parse(tk[2]), tk[3]));
return(str2arr(x != null ? "Done." : "Error!"));
}