createVpc 
  Creates a VPC with the specified CIDR blocks.
A VPC must have an associated IPv4 CIDR block. You can choose an IPv4 CIDR block or an IPAM-allocated IPv4 CIDR block. You can optionally associate an IPv6 CIDR block with a VPC. You can choose an IPv6 CIDR block, an Amazon-provided IPv6 CIDR block, an IPAM-allocated IPv6 CIDR block, or an IPv6 CIDR block that you brought to Amazon Web Services. For more information, see IP addressing for your VPCs and subnets in the Amazon VPC User Guide.
By default, each instance that you launch in the VPC has the default DHCP options, which include only a default DNS server that we provide (AmazonProvidedDNS). For more information, see DHCP option sets in the Amazon VPC User Guide.
You can specify DNS options and tenancy for a VPC when you create it. You can't change the tenancy of a VPC after you create it. For more information, see VPC configuration options in the Amazon VPC User Guide.
Samples
fun main() { 
   //sampleStart 
   // This example creates a VPC with the specified CIDR block.
val resp = ec2Client.createVpc {
    cidrBlock = "10.0.0.0/16"
} 
   //sampleEnd
}