public MethodResult CanSendFriendRequest(Citizen proposer, Citizen other)
{
if (friendRepository.AreFriends(proposer, other))
{
return(new MethodResult("You are already friends!"));
}
if (friendRepository.AnyFriendRequestBetween(proposer, other))
{
return(new MethodResult("There is already friend request between you!"));
}
return(MethodResult.Success);
}