docs: public static String capitalize(String pString, int pIndex) {
          if (pIndex < 0) {
              throw new IndexOutOfBoundsException("Negative index not allowed: " + pIndex);
          }
          if (pString == null || pString.length() <= pIndex) {
              return pString;
          }
  
          // This is the fastest method, according to my tests
  
          // Skip array duplication if allready capitalized
          if (Character.isUpperCase(pString.charAt(pIndex))) {
              return pString;
          }
  
          // Convert to char array, capitalize and create new String
          char[] charArray = pString.toCharArray();
          charArray[pIndex] = Character.toUpperCase(charArray[pIndex]);
          return new String(charArray);
  
          /**
           StringBuilder buf = new StringBuilder(pString);
           buf.setCharAt(pIndex, Character.toUpperCase(buf.charAt(pIndex)));
           return buf.toString();
           //*/
  
          /**
           return pString.substring(0, pIndex)
           +  Character.toUpperCase(pString.charAt(pIndex))
           + pString.substring(pIndex + 1);
           //*/
      }