New version which was lost after removing repo.

src/difflib/StringUtills.java

@@ -0,0 +1,53 @@
+package difflib;
+
+import java.util.*;
+
+public class StringUtills {
+	
+	public static <T> String join(final Iterable<T> objs, final String delimiter) {
+	    Iterator<T> iter = objs.iterator();
+	    if (!iter.hasNext()) {
+	        return "";
+	    }
+	    StringBuffer buffer = new StringBuffer(String.valueOf(iter.next()));
+	    while (iter.hasNext()) {
+	        buffer.append(delimiter).append(String.valueOf(iter.next()));
+	    }
+	    return buffer.toString();
+	}
+	
+	public static String expandTabs(String str) {
+		return str.replace("\t", "    ");
+	}
+	
+	public static String htmlEntites(String str) {
+		return str.replace("<", "&lt;").replace(">", "&gt;");
+	}
+	
+	public static String normalize(String str) {
+		return expandTabs(htmlEntites(str));
+	}
+	
+	public static List<String> normalize(List<String> list) {
+		List<String> result = new LinkedList<String>();
+		for (String line: list) {
+			result.add(normalize(line));
+		}
+		return result;
+	}
+
+	public static List<String> wrapText(List<String> list, int columnWidth) {
+		List<String> result = new LinkedList<String>();
+		for (String line: list) {
+			result.add(wrapText(line, columnWidth));
+		}
+		return result;
+	}
+	
+	public static String wrapText(String line, int columnWidth) {
+		if (line.length() > columnWidth) {
+			return line.subSequence(0, columnWidth) + "<br>" + line.substring(columnWidth);
+		}
+		return line;
+	}
+}