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if len(t_id) == 0:
   t_id = 0

if len(t_from) != 20:
    return False

if len(t_to) != 20:
    return False

if t_from == t_to:
    print("transfer to self!")
    return True

t_owner = Get(ctx, t_id)

if len(t_owner) != 20:
    print("token does not exist")
    return False

approval_key = concat("approved/", t_id)
authorized_spender = Get(ctx, approval_key)

if len(authorized_spender) == 0:
    print("no approval exists for this token")
    return False

if authorized_spender:
    res = removeTokenFromOwnersList(ctx, t_owner, t_id)
    if res == False:
        print("unable to transfer token")
        return False

    addTokenToOwnersList(ctx, t_to, t_id)

    Put(ctx, t_id, t_to)

    # remove the approval for this token
    Delete(ctx, approval_key)

    print("transfer complete")

    OnTransfer(t_owner, t_to, 1)
    OnNFTTransfer(t_owner, t_to, t_id)

    return True

print("transfer by tx sender not approved by token owner")
return False`