comefrom: <awangdev>151. Reverse Words in a String_1.java
code: public String reverseWords(String s) {
          if (s == null) return s;
  
          String[] strs = s.split(" ");
          StringBuffer sb = new StringBuffer();
          for (String str : strs) {
              if (str.length() != 0) sb.insert(0, str + " ");
          }
          return sb.toString().trim();
      }
masked: public String var_0 ( String var_2 ) {
    if ( var_2 == null ) return var_2 ;
    String [ ] var_6 = var_2 . split ( " " ) ;
    StringBuffer var_8 = new StringBuffer ( ) ;
    for ( String var_9 : var_6 ) {
      if ( var_9 . length ( ) != 0 ) var_8 . insert ( 0 , var_9 + " " ) ;
    }
    return var_8 . toString ( ) . trim ( ) ;
  }
  