fix windows by removing unsupported dir characters

Author: garymathews

src/data_types.rs

@@ -183,7 +183,12 @@ pub struct DataDirMnemonic<'a> {
 impl<'a> DataDir<'a> {
     pub fn challenge_dir(&'a self, base_dir: &str, challenge_id: &str) -> Result<PathBuf, String> {
         let mut path = PathBuf::from(base_dir);
-        path.push(challenge_id);
+        if cfg!(target_os = "windows") {
+            // Directories with '*' are not supported on windows
+            path.push(challenge_id.replace("*", ""));
+        } else {
+            path.push(challenge_id);
+        }
         Ok(path)
     }