private static String toProperCase(String s) {
    return s.substring(0, 1).toUpperCase() + s.substring(1).toLowerCase();
  }
Convert input string to proper format. That is, capitalize first letter and keep remaining letters lowercase.
@param s the input string to convert.
@return capitalized string.
ambry-server/src/main/java/com/github/ambry/server/AmbryStatsReportImpl.java