The elves were huddled at a desk, deep in debate over their Neovim setups.

“I finally nailed my init.lua,” said Sparky. “Switched to bspwm, too. Total game-changer.”

“Pfft,” Tinker scoffed. “Real pros stick to Vimscript. You don’t need all those plugins.”

Jingle sipped his eggnog. “I wrote a whole game in Vim once. Problem? Couldn’t press two keys at the same time. Now it’s turn-based.”

Before they could laugh, the door slammed open. Santa stormed in once again. “Do I pay you to yap about text editors?”

The elves froze as Santa tossed a crumpled piece of code onto the table. “The sleigh builder is completely broken! I just tried to build a sleigh, and it’s missing half the parts. Magical enhancements? Gone. Gift capacity? Zero. Someone explain this!”

Sparky glanced at the code and gulped. “This… uh… looks like something from that old project nobody touched.”

“Exactly!” Santa growled. “And now it’s ruining everything. We’re rewriting this in Rust. Get to work, before I replace you all with AI!”

To help Santa build his new sleigh easily, we need to create him a SleighBuilder that can build and return Sleigh instances.

The SleighBuilder should have:

• An associated function new that creates a new SleighBuilder instance.
• red, reindeer-powered, 100, and false are the default values for the sleigh.
• A method named color that takes a &str and sets the color of the sleigh.
• A method named engine that takes a &str and sets the engine of the sleigh.
• A method named gift_capacity that accepts a u32 and sets the gift capacity of the sleigh.
• A method named magical_enhancements that sets the magical enhancements of the sleigh.
• A final method that is going to return a Sleigh instance called build.

Make sure that each method takes ownership of the SleighBuilder instance and returns it after mutation.

Have a look at the end of the file to see how Santa wants to use this API.

If you're stuck or need a starting point, here are some hints to help you along the way!