Pass

**Very well done Carl!**

Tips: Don't initialise unessecary mutable variables.

_Your code_:
```rust
let mut lines = stream
.lock()
.lines()
.map(|_line| _line
.ok()
.unwrap());

// Collect inputs in a vector
let inputs = lines
.next()
.unwrap()
.split_whitespace()
.map(|_number| _number
.parse::()
.unwrap())
.collect::>();
```

_Optimised version_:
```rust
let inputs = stream
.lock()
.lines()
.next().unwrap()
.ok().unwrap()
.split_whitespace()
.map(|_number| _number.parse().unwrap())
.collect::>();
```

Start with the Rust input-handling code shown in the issue and compare the mutable `lines` version with the optimized version. Remove the unnecessary mutable binding while preserving the existing input parsing behavior; the work is done when the simpler form is used and the code still compiles.

Written by the indexing model from the issue text.