no need to check first.

src/util.rs

@@ -137,11 +137,7 @@ pub(crate) fn base_name(path: &Path) -> &str {
 
 /// Decode hex string with or without 0x prefix
 pub fn decode_hex(input: &str) -> Result<Vec<u8>, hex::FromHexError> {
-    if input.starts_with("0x") {
-        hex::decode(input.trim_start_matches("0x"))
-    } else {
-        hex::decode(input)
-    }
+    hex::decode(input.trim_start_matches("0x"))
 }
 
 /// Prints to stdout if `verbosity.is_verbose()` is `true`.

transcode/src/util.rs

@@ -16,9 +16,5 @@
 
 /// Decode hex string with or without 0x prefix
 pub fn decode_hex(input: &str) -> Result<Vec<u8>, hex::FromHexError> {
-    if input.starts_with("0x") {
-        hex::decode(input.trim_start_matches("0x"))
-    } else {
-        hex::decode(input)
-    }
+    hex::decode(input.trim_start_matches("0x"))
 }