find-the-index-of-the-first-occurrence-in-a-string/src/main.rs


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fn main() {
    println!("Hello, world!");
}

struct Solution;

impl Solution {
    pub fn str_str(haystack: String, needle: String) -> i32 {
        match haystack.find(&needle) {
            None => -1,
            Some(e) => e as i32
        }
    }
}