initial codewars submission

src/main.rs

@@ -1,3 +1,59 @@
 fn main() {
-    println!("Hello, world!");
+    println!();
+
+    let mut str = ('a'..='z').collect::<String>();
+    let bad = ('n'..='z').collect::<String>();
+    let rng: Vec<_> = ('n'..='z').collect();
+    let err: &[_] = &&rng;
+    let sls = "";
+    let st2 = "kkkwwwaaaaaaaaaaaaaabbbbbbbbbbbbbbbbbbmmmmmmmmmmmmmmmmmmmxyz";
+
+    println!("{:?}\t{:?}\t{:?}\t{:?}",
+        func(&str),
+        &str.trim_matches(err),
+        str.len(),
+        sls
+    );
+
+    println!("\n{:?}\n{:?}\t{:?}:{:?}",
+        st2,
+        st2.chars().filter(|&c| err.contains(&c)).collect::<String>(),
+        st2.chars().filter(|&c| "nopqrstuvwxyz".contains(c)).count(),
+        st2.len()
+    );
+
+    println!("\n{:?}\n{:?}\t{:?}:{:?}",
+        st2,
+        st2.chars().filter(|&c| c > 'm').collect::<String>(),
+        st2.chars().filter(|&c| c > 'm').count(),
+        st2.len()
+    );
+
+    println!("\n{:?}\t{:?}",
+        str,
+        str.chars().filter(|&c| err.contains(&c)).collect::<String>(),
+    );
+
+    println!();
+}
+
+fn func(s: &str) -> String {
+    s.into()
+}
+fn printer_error(s: &str) -> String {
+    format!("{}/{}",
+        s.chars().filter(|&c| "nopqrstuvwxyz".contains(c)).count(),
+        s.len()
+    )
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    #[test]
+    fn should_pass_all_the_tests_provided() {
+        assert_eq!(&printer_error("aaaaaaaaaaaaaaaabbbbbbbbbbbbbbbbbbmmmmmmmmmmmmmmmmmmmxyz"), "3/56");
+        assert_eq!(&printer_error("kkkwwwaaaaaaaaaaaaaabbbbbbbbbbbbbbbbbbmmmmmmmmmmmmmmmmmmmxyz"), "6/60");
+        assert_eq!(&printer_error("kkkwwwaaaaaaaaaaaaaabbbbbbbbbbbbbbbbbbmmmmmmmmmmmmmmmmmmmxyzuuuuu"), "11/65");
+    }
 }