Code shared from the Rust Playground

playground.rs

// https://dev.to/thepracticaldev/daily-challenge-29-xs-and-os-12mj

pub fn xo (value: &str) -> bool {
    let value = value.to_lowercase();
    let count_x = value.matches("x").count();
    let count_o = value.matches("o").count();
    count_x == count_o
}

#[cfg(test)]
mod tests {
    use super::*;
    #[test]
    fn test_1() {
        assert_eq!(xo("ooxx"), true);
    }
    #[test]
    fn test_2() {
        assert_eq!(xo("xooxx"), false);
    }
    #[test]
    fn test_3() {
        assert_eq!(xo("ooxXm"), true);
    }
    #[test]
    fn test_4() {
        assert_eq!(xo("zzoo"), false);
    }
    #[test]
    fn test_5() {
        assert_eq!(xo("zpzpzpp"), true);
    }
    
}