Regroup the chained calls to `.replace()` into a single one

acme_common/src/crypto.rs

@@ -58,7 +58,7 @@ impl FromStr for BaseHashFunction {
     type Err = Error;
 
     fn from_str(s: &str) -> Result<Self, Error> {
-        let s = s.to_lowercase().replace('-', "").replace('_', "");
+        let s = s.to_lowercase().replace(['-', '_'], "");
         match s.as_str() {
             "sha256" => Ok(BaseHashFunction::Sha256),
             "sha384" => Ok(BaseHashFunction::Sha384),

acmed/src/config.rs

@@ -483,7 +483,7 @@ impl Certificate {
                 id.to_string()
             }
         };
-        let name = name.replace('*', "_").replace(':', "_").replace('/', "_");
+        let name = name.replace(['*', ':', '/'], "_");
         Ok(name)
     }