Refactor to utilize iterators and matching, rather than if

src/lib.rs

@@ -1,28 +1,12 @@
 pub fn reply(message: &str) -> &str {
-    let mut question = false;
 
-    if message.trim().chars().last() == Some('?') {
-        question = true;
-    }
-
-    let mut u = 0;
-    let mut l = 0;
-    let mut n = 0;
-    let mut shouted = false;
-    let mut silence = false;
-
-    for char in message.chars() {
-        if char.is_uppercase() {
-            u += 1;
-        } else if char.is_lowercase() {
-            l += 1;
-        } else if char.is_numeric() {
-            n += 1;
-        }
-    }
+    let uc = message.matches(char::is_uppercase).count();
+    let lc = message.matches(char::is_lowercase).count();
+    let an = message.matches(char::is_alphanumeric).count();
 
-    if u > l { shouted = true; }
-    if u+l+n == 0 { silence = true; }
+    let question = message.trim().chars().last() == Some('?');
+    let shouted = uc > lc;
+    let silence = an == 0;
 
     match (question,shouted, silence) {
         (true,true, _  ) => "Calm down, I know what I'm doing!",