Write a Simple blockchain in Golang

package main

import (
    "crypto/sha256"
    "encoding/hex"
    "fmt"
    "time"
)

// Block represents a single block in the blockchain
type Block struct {
    Index     int
    Timestamp string
    Data      string
    PrevHash  string
    Hash      string
}

// Blockchain represents the entire blockchain
type Blockchain struct {
    Chain []Block
}

// CalculateHash calculates the hash of a block
func CalculateHash(block Block) string {
    record := string(block.Index) + block.Timestamp + block.Data + block.PrevHash
    hash := sha256.New()
    hash.Write([]byte(record))
    hashed := hash.Sum(nil)
    return hex.EncodeToString(hashed)
}

// GenerateBlock creates a new block in the blockchain
func (chain *Blockchain) GenerateBlock(data string) Block {
    prevBlock := chain.Chain[len(chain.Chain)-1]
    newBlock := Block{
        Index:     prevBlock.Index + 1,
        Timestamp: time.Now().String(),
        Data:      data,
        PrevHash:  prevBlock.Hash,
    }
    newBlock.Hash = CalculateHash(newBlock)
    return newBlock
}

// AddBlock adds a new block to the blockchain
func (chain *Blockchain) AddBlock(data string) {
    newBlock := chain.GenerateBlock(data)
    chain.Chain = append(chain.Chain, newBlock)
}

// GenesisBlock creates the first block in the blockchain
func GenesisBlock() Block {
    return Block{
        Index:     0,
        Timestamp: time.Now().String(),
        Data:      "Genesis Block",
        PrevHash:  "",
        Hash:      "",
    }
}

func main() {
    // Create a new blockchain with the genesis block
    blockchain := Blockchain{[]Block{GenesisBlock()}}

    // Add some blocks to the blockchain
    blockchain.AddBlock("Transaction 1")
    blockchain.AddBlock("Transaction 2")

    // Print the entire blockchain
    for _, block := range blockchain.Chain {
        fmt.Printf("Index: %d\n", block.Index)
        fmt.Printf("Timestamp: %s\n", block.Timestamp)
        fmt.Printf("Data: %s\n", block.Data)
        fmt.Printf("Previous Hash: %s\n", block.PrevHash)
        fmt.Printf("Hash: %s\n", block.Hash)
        fmt.Println()
    }
}