Returning impl Trait

Rust's impl Trait syntax allows for concise and flexible code, especially when returning iterators or other complex types. By using impl Trait, you can abstract away concrete types while ensuring optimal performance through Rust's zero-cost abstractions.

In this challenge, you will implement a function that filters strings from a slice, returning only those that start with a given keyword. The function will return an iterator over the filtered results. This approach demonstrates how to combine Rust's iterator combinators with the impl Trait syntax.

Your Task

Write a function named filter_starts_with that:

  1. Accepts two arguments:
    • A slice of String
    • A &str keyword
  2. Returns an iterator that filters and yields only the strings starting with the given keyword.

Hints
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  • Use .iter() to iterate over references to the strings in the slice.
  • The filter method takes a closure to apply a filtering condition.
  • Use the starts_with method to check if a string starts with a keyword.
  • Use move in the closure to capture the keyword.