Fixed s3 document issue

src/main/java/net/gepafin/tendermanagement/util/Utils.java

@@ -308,4 +308,11 @@ public class Utils {
 
 		return new StringTokenizer(header, ",").nextToken().trim();
 	}
+
+	public static String replaceSpacesWithUnderscores(String content) {
+		if (content == null) {
+			return null;
+		}
+		return content.trim().replace(" ", "_");
+	}
 }