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Nueva clase cuya función será separar de una cadena con una dirección de email, la correspondiente subcadena con el dominio.\n* **`kata4.view`=\u003e En este paquete insertamos las **clases de Vista**:\n    * `HistogramDisplay` (la copiamos de la [versión 2 de Kata3](https://github.com/gitfrandu4/Kata3/blob/master/src/kata3/HistogramDisplay.java)).\n    * `MailListReader`. Nueva clase cuya función será leer del fichero de texto los emails y crear una lista de correos válidos. Debemos tener en cuenta que en fichero [email.txt](https://github.com/gitfrandu4/Kata4/blob/master/email.txt) hay cadenas que no se corresponden con direcciones de email. \n    * `MailHistogramBuilder`. Nueva clase cuya función será construir un Histograma a partir de una lista de emails válidos. \n\n### Kata4 versión 2\n\n\u003cimg src=\"https://github.com/gitfrandu4/Kata4/blob/master/imgs/kata4_v2.png\" alt=\"Kata3_v1\" width=\"720\" height=\"486\" /\u003e\n\nSe debe reestructurar la clase de Control, **Kata 4** usando el **Modelo CIPO** (_Control-Input-Process-Output_) y para hacerlo se deben crear los módulos `execute()`, `input()`, `process()` y `output()` moviendo el correspondiente código a estos módulos. Ver figura.\n","project_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fgitfrandu4%2Fkata4","html_url":"https://awesome.ecosyste.ms/projects/github.com%2Fgitfrandu4%2Fkata4","lists_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fgitfrandu4%2Fkata4/lists"}