Fix getResource("") failing to return valid resource

Fixes #187

Author: embeddedt

forge/src/main/java/org/embeddedt/modernfix/forge/classloading/ModernFixResourceFinder.java

@@ -92,7 +92,20 @@ private static Iterable<Path> getRootPathForLocator(IModLocator locator, ModFile
     }
 
     public static Enumeration<URL> findAllURLsForResource(String input) {
-        // CachedResourcePath normalizes already
+        // CachedResourcePath normalizes already but we need to strip trailing slash if any
+        // TODO move logic to FileUtil.normalize()
+        int lastIndex = input.length();
+        boolean strip = false;
+        while(lastIndex > 1) {
+            char c = input.charAt(lastIndex - 1);
+            if (c == '/' || c == '\\') {
+                lastIndex--;
+                strip = true;
+            } else
+                break;
+        }
+        if(strip)
+            input = input.substring(0, lastIndex);
         Collection<String> urlList = urlsForClass.get(new CachedResourcePath(input));
         if(!urlList.isEmpty()) {
             String pathInput = FileUtil.normalize(input);