pkstrings: implement TryFrom<&str> via TryFrom<String>

Signed-off-by: Maxime “pep” Buquet <pep@bouah.net>

pkstrings/src/lib.rs

@@ -147,13 +147,7 @@ impl TryFrom<&str> for PKString {
     type Error = Error;
 
     fn try_from(data: &str) -> Result<PKString, Error> {
-        for chr in data.chars() {
+        PKString::try_from(String::from(data))
-            if ! STRTOHEX.contains_key(&chr) {
-                return Err(Error::InvalidCharacter);
-            }
-        }
-
-        Ok(PKString(String::from(data)))
     }
 }