code: private String findCompressionLiteral(String src) {
          if (src == null) {
              LOGGER.warn(NULL_COMPRESSION_LITERAL);
              return null;
          }
  
          for (String supported : LITERALS_TO_DECOMPRESSOR.keySet()) {
              if (src.contains(supported)) {
                  return supported;
              }
          }
          LOGGER.debug(NO_SUPPORTED_COMPRESSION_LITERAL);
          return null;
      }
docs: Return the compression literal if it is contained in the input string.
  If the are many the first match is return.
  If there are no matches, <code>null</code> is returned
  
  @param src input string to look for matches
  @return First match of a supported compression literal or null if no literal matches the input string.