突如其来的变化

描述：

给你一个由”a”,”b”,”c”三个字符组成的字符串，将其中的a替换成b，b替换成a，c保持不变

例如：

‘acb’ –> ‘bca’
‘aabacbaa’ –> ‘bbabcabb’

MyCode:

public class Kata{  public static string Switcheroo(string x)  {    string y = x.Replace("a","d");    string z = y.Replace("b","a");    string retStr = z.Replace("d","b");    return retStr;  }}

CodeWar:

public class Kata{  public static string Switcheroo(string x)  {    return x.Replace("a","d").Replace("b","a").Replace("d","b");  }}