comefrom: <qiyuangong>005_Longest_Palindromic_Substring_1.java
code: private int expandAroundCenter(String s, int left, int right) {
          int L = left, R = right;
          while (L >= 0 && R < s.length() && s.charAt(L) == s.charAt(R)) {
              L--;
              R++;
          }
          return R - L - 1;
      }
masked: private int sample_funcname ( String var_1 , int var_2 , int var_3 ) {
    int var_4 = var_2 , var_5 = var_3 ;
    while ( var_4 >= 0 && var_5 < var_1 . length ( ) && var_1 . charAt ( var_4 ) == var_1 . charAt ( var_5 ) ) {
      var_4 -- ;
      var_5 ++ ;
    }
    return var_5 - var_4 - 1 ;
  }
  