message: Helper methods for RSS Expanded Reader
diff: @@ -31,6 +31,11 @@ export default class StringBuilder {
  return this.value;
  }
  + //helper method for RSS Expanded
  + public setLengthToZero(): void {
  + this.value = "";
  + }
  +
  public insert(n: number, c: string) {
  this.value = this.value.substr(0, n) + c + this.value.substr(n + c.length);
  }
  