deleteInternetGateway  
  abstract suspend fun deleteInternetGateway(input: DeleteInternetGatewayRequest): DeleteInternetGatewayResponse
Deletes the specified internet gateway. You must detach the internet gateway from the VPC before you can delete it.
Samples
fun main() { 
   //sampleStart 
   // This example deletes the specified Internet gateway.
ec2Client.deleteInternetGateway {
    internetGatewayId = "igw-c0a643a9"
} 
   //sampleEnd
}