How can delete all wrong command in the console?

Question

I have written a wrong create statement in psql console.Create a database mytest and enter it.

postgres=# create database  mytest;
CREATE DATABASE
postgres=# \c mytest
You are now connected to database "mytest" as user "postgres".

Type a wrong statement and press enter ,it becomes:

mytest=# create table mytest(report text
mytest(#

Now i write a right statement :

mytest(#create table mytest(report text);

It can't execute ,no new table created ,maybe some cache in the psql ,how to remove them?