```go

package amazon

import (
    "bytes"
    "context"

    "github.com/aws/aws-sdk-go-v2/aws"
    "github.com/aws/aws-sdk-go-v2/config"
    "github.com/aws/aws-sdk-go-v2/credentials"
    "github.com/aws/aws-sdk-go-v2/service/s3"
)

type amazonClient struct {
    ctx *s3.Client
    bucket string
}

func NewAmazonClient(bucketUrl, accessKey, secretAccessKey, workingBucket string) *amazonClient {
    r2Resolver := aws.EndpointResolverWithOptionsFunc(func(service, region string, options ...interface{}) (aws.Endpoint, error) {
        return aws.Endpoint{
            URL: bucketUrl,
        }, nil
    })

    cfg, err := config.LoadDefaultConfig(context.TODO(),
        config.WithEndpointResolverWithOptions(r2Resolver),
        config.WithCredentialsProvider(credentials.NewStaticCredentialsProvider(accessKey, secretAccessKey, "")),
    )
    if err != nil {
        panic(err.Error())
    }

    return &amazonClient{
        ctx: s3.NewFromConfig(cfg),
        bucket: workingBucket,
    }
}

func (a *amazonClient) GetObject(key string) ([]byte, error) {
    output, err := a.ctx.GetObject(context.TODO(), &s3.GetObjectInput{
        Bucket: aws.String(a.bucket),
        Key: aws.String(key),
    })
    if err != nil {
        return nil, err
    }

    buf := new(bytes.Buffer)
    buf.ReadFrom(output.Body)
    return buf.Bytes(), nil
}

func (a *amazonClient) PutObject(key string, data []byte) error {
    _, err := a.ctx.PutObject(context.TODO(), &s3.PutObjectInput{
        Bucket: aws.String(a.bucket),
        Key: aws.String(key),
        Body: bytes.NewReader(data),
    })
    return err
}

package amazon

import (
    "bytes"
    "context"

    "github.com/aws/aws-sdk-go-v2/aws"
    "github.com/aws/aws-sdk-go-v2/config"
    "github.com/aws/aws-sdk-go-v2/credentials"
    "github.com/aws/aws-sdk-go-v2/service/s3"
)

type amazonClient struct {
    ctx *s3.Client
    bucket string
}

func NewAmazonClient(bucketUrl, accessKey, secretAccessKey, workingBucket string) *amazonClient {
    r2Resolver := aws.EndpointResolverWithOptionsFunc(func(service, region string, options ...interface{}) (aws.Endpoint, error) {
        return aws.Endpoint{
            URL: bucketUrl,
        }, nil
    })

    cfg, err := config.LoadDefaultConfig(context.TODO(),
        config.WithEndpointResolverWithOptions(r2Resolver),
        config.WithCredentialsProvider(credentials.NewStaticCredentialsProvider(accessKey, secretAccessKey, "")),
    )
    if err != nil {
        panic(err.Error())
    }

    return &amazonClient{
        ctx: s3.NewFromConfig(cfg),
        bucket: workingBucket,
    }
}

func (a *amazonClient) GetObject(key string) ([]byte, error) {
    output, err := a.ctx.GetObject(context.TODO(), &s3.GetObjectInput{
        Bucket: aws.String(a.bucket),
        Key: aws.String(key),
    })
    if err != nil {
        return nil, err
    }

    buf := new(bytes.Buffer)
    buf.ReadFrom(output.Body)
    return buf.Bytes(), nil
}

func (a *amazonClient) PutObject(key string, data []byte) error {
    _, err := a.ctx.PutObject(context.TODO(), &s3.PutObjectInput{
        Bucket: aws.String(a.bucket),
        Key: aws.String(key),
        Body: bytes.NewReader(data),
    })
    return err
}