Calculate the least common multiple of multiple values
```rust fn run() { let v: Vec = vec![1, 2, 3, 4]; let l = lcmx(&v).unwrap(); println!("{}", l); assert_eq!(l, 12);
let v: Vec<u32> = vec![1, 2, 3, 99]; let l = lcmx(&v).unwrap(); println!("{}", l); assert_eq!(l, 198);
} ```