func: function receiveAirDrop() public {
          if (isTestAccount[msg.sender]) {
              
              token.transfer(msg.sender, airDropAmount);
          } else {
              require(isValidAirDropForIndividual());
  
              
              invalidAirDrop[msg.sender] = true;
  
              
              arrayAirDropReceivers.push(msg.sender);
  
              
              token.transfer(msg.sender, airDropAmount);
  
              emit LogAirDrop(msg.sender, airDropAmount);
          }
      }