code: public static String lcFirst(String str) {
  	if (str == null) return null;
  	else if (str.length() <= 1) return str.toLowerCase();
  	else {
  	    return str.substring(0, 1).toLowerCase() + str.substring(1);
  	}
      }
docs: do first Letter Upper case
  
  @param str String to operate
  @return lower case String