diff --git a/src/main.rs b/src/main.rs
index d14790d..512efd0 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -50,7 +50,7 @@ fn main() {
     println!("{}", generate_sieve_script(parse_alias_to_map(alias_files)));
 }
 
-/// Read a virtual alias file (http://www.postfix.org/virtual.5.html)
+/// Read a virtual alias file <https://www.postfix.org/virtual.5.html>
 /// and convert it to a map of destination addresses to a list of their final forwarding addresses.
 fn parse_alias_to_map(alias_files: Vec<AliasFile>) -> AliasMap {
     // File must exist in the current path
@@ -74,7 +74,7 @@ fn parse_alias_to_map(alias_files: Vec<AliasFile>) -> AliasMap {
                 .split_at(line.find(char::is_whitespace).unwrap_or(0))
                 .1
                 .split(' ')
-                .filter(|address| address.trim().to_string().replace(',', "") != "")
+                .filter(|address| !address.trim().to_string().replace(',', "").is_empty())
                 .map(|addr| to_mailaddress(addr, &alias_file.default_domain))
                 .collect();
 
@@ -116,16 +116,14 @@ fn parse_alias_to_map(alias_files: Vec<AliasFile>) -> AliasMap {
             *redirect_map.get_mut(&destination).unwrap() = new_redirect;
         }
     }
-    if iterations == max_iterations {
-        panic!("Possibly infinite recursion detected in parse_alias_map. Did not terminate after {max_iterations} rounds.");
-    }
+    assert!(iterations != max_iterations, "Possibly infinite recursion detected in parse_alias_map. Did not terminate after {max_iterations} rounds.");
     redirect_map
 }
 
-/// Generate a Sieve script (https://en.wikipedia.org/wiki/Sieve_(mail_filtering_language))
+/// Generate a Sieve script <https://en.wikipedia.org/wiki/Sieve_(mail_filtering_language)>
 /// from a map of destination addresses to a list of their forwarding addresses.
 ///
-/// Addresses are sorted according to the order on OrdEmailAddress.
+/// Addresses are sorted according to the order on `OrdEmailAddress`.
 fn generate_sieve_script(redirects: AliasMap) -> String {
     let mut script: String = "require [\"envelope\", \"copy\"];\n\n".to_string();
     for (redirect, mut destinations) in redirects {
@@ -147,7 +145,7 @@ fn generate_sieve_script(redirects: AliasMap) -> String {
     script
 }
 
-/// Create an OrdEmailAddress from some alias entry.
+/// Create an `OrdEmailAddress` from some alias entry.
 /// Return parameter for complete mail addresses and append the default domain for local parts.
 fn to_mailaddress(alias_entry: &str, default_domain: &FQDN) -> OrdEmailAddress {
     let mut addr = alias_entry.trim().to_string();