code: private static char firstNonWhitespace( StringBuilder builder ) {
          for( int i = 0; i < builder.length(); i++ ) {
              if( !Character.isWhitespace( builder.charAt( i ) ) ) {
                  return builder.charAt( i );
              }
          }
          return ' ';
      }
docs: The first character in the builder that is not a whitespace. Else there are only whitespaces
  
  @param builder
  the builder.
  @return the first non whitespace