(a) A person is guilty of solicitation to commit a felony if, with intent that a felony be committed, he commands, encourages or facilitates the commission of that crime under circumstances strongly corroborative of the intention that the crime be committed but the solicited crime is not attempted or committed.
(b) A person is not liable under this section if, after soliciting another person to commit a crime, he persuaded the other person not to do so or otherwise prevented the commission of the crime, under circumstances manifesting a voluntary and complete renunciation of his criminal intention.