Function search_case_insensitive 

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

search string in case insensitive

Examples

let query = "duct"
   let contents = "\
Rust:
safe, fast, productive.
Pick three
Duct tape.";
assert_eq!(vec!["safe, fast, productive."], search(query, contents));