Day 1 10.6 Elevator Events code duplication

[djmitche]

Discussed in #1525

^{Originally posted by ksoo November 29, 2023}
The code on Day 1 10.6 Elevator Events (https://google.github.io/comprehensive-rust/user-defined-types/exercise.html) seems to be duplicated multiple times. Was there some sort of bug in the generation of this page?