Function kean_minigrep::search_case_insensitive

pub fn search_case_insensitive<'a>(
    query: &str,
    contents: &'a str
) -> Vec<&'a str>

在内容中搜索字符串，忽略大小写.

示例

let query = "rUsT";
let contents = "\
Rust:
safe, fast, productive.
Pick three.
Trust me.";

assert_eq!(
   vec!["Rust:", "Trust me."],
   kean_minigrep::search_case_insensitive(query, contents)
);