Authorizing a certain individual to file a motion to reduce the duration of a certain sentence if the individual was convicted between the ages of at least 18 and under 25, was not sentenced to life, is not a sex offender, has served at least 20 years of the term of confinement, and was not convicted of murder involving a victim who was a first responder who was killed in the line of duty; applying procedures for a proceeding under the Act; etc.