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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def cloudshell_model_name(self):
 """Return the name of the CloudShell model"""

        if self.shell_name:
            return "{shell_name}.{resource_model}".format(shell_name=self.shell_name,
                                                          resource_model=self.RESOURCE_MODEL.replace(" ", ""))
        else:
            return self.RESOURCE_MODEL