title: Decode Median String Original String
signature: decodeMedianStringOriginalString(s) {
test_code: import 'dart:convert';
  
  // SOLUTION CODE
  // ============================================
  PLACEHOLDER_CODE_BODY
  
  // TESTING CODE 
  // ============================================
  bool validateSolution(String actual, String expected){
      return actual.toString() == expected.toString();
  }
  
  String driver(s, String expected){
      try
      {
          if (validateSolution(PLACEHOLDER_FN_NAME(s), expected)){
              return "PASSED";
          }
          return "FAILED";
      }catch(exception_object){
          return exception_object.runtimeType.toString();
      }
  }
  
  int main() {
  
      print("TEST-0...${driver(
          " EgvQCeqYpZtv", 
          "tpqCvE gQeYZv")
      }");
  
      print("TEST-1...${driver(
          "488540", 
          "484850")
      }");
  
      print("TEST-2...${driver(
          "0000101010111", 
          "1000000011111")
      }");
  
      print("TEST-3...${driver(
          "syw", 
          "ysw")
      }");
  
      print("TEST-4...${driver(
          "402355", 
          "524035")
      }");
  
      print("TEST-5...${driver(
          "0", 
          "0")
      }");
  
      print("TEST-6...${driver(
          "wmHMlAtq", 
          "tlHwmMAq")
      }");
  
      print("TEST-7...${driver(
          "7962", 
          "6792")
      }");
  
      print("TEST-8...${driver(
          "111111", 
          "111111")
      }");
  
      print("TEST-9...${driver(
          "UbgRGDquop", 
          "oqGgUbRDup")
      }");
  
      return 0;
  }
source_py: def decode_median_string_original_string(s):
      l = len(s)
      s1 = ''
      if ((l % 2) == 0):
          isEven = True
      else:
          isEven = False
      for i in range(0, l, 2):
          if isEven:
              s1 = (s[i] + s1)
              s1 += s[(i + 1)]
          elif ((l - i) > 1):
              s1 += s[i]
              s1 = (s[(i + 1)] + s1)
          else:
              s1 += s[i]
      return s1
source_cpp: string decode_median_string_original_string(string s) {
    int l = s . length ( );
    string s1 = "";
    bool isEven = ( l % 2 == 0 ) ? true : false;
    for ( int i = 0;
    i < l;
    i += 2 ) {
      if ( isEven ) {
        s1 = s [ i ] + s1;
        s1 += s [ i + 1 ];
      }
      else {
        if ( l - i > 1 ) {
          s1 += s [ i ];
          s1 = s [ i + 1 ] + s1;
        }
        else {
          s1 += s [ i ];
        }
      }
    }
    return s1;
  }