vanderlei-dev

using System.Text.Json.Serialization;
using RestSharp.Authenticators;

namespace RestSharp.Tests.External.Twitter;

public interface ITwitterClient
{
    Task<TwitterUser> GetUser(string user);
}

vanderlei-dev

public ReadOnlySpan<char> FormatarCpf(string cpf)
{
    Span<char> formattedValue = stackalloc char[14];

    Copy(cpf, startIndex: 0, length: 3, ref formattedValue, insertIndex: 0);
    formattedValue[3] = '.';

    Copy(cpf, startIndex: 3, length: 3, ref formattedValue, insertIndex: 4);
    formattedValue[7] = '.';

vanderlei-dev

public string FormatarCpf(string cpf)
{
    return Convert.ToUInt64(cpf).ToString(@"000\.000\.000\-00");
}

vanderlei-dev

public string FormatarCpf(string cpf)
{
    // cpf: 12345678909    
    
    return $"{cpf.Substring(0, 3)}." + // 123.
           $"{cpf.Substring(3, 3)}." + // 456.
           $"{cpf.Substring(6, 3)}-" + // 789- 
           $"{cpf.Substring(9, 2)}";   // 09
    
    // resultado: 123.456.789-09