[ruby] drill output

Question 1 Let's create a function to enter a name. If there is a period (.) Or a space other than the name, an error will be displayed.

If you don't understand, use the API to solve the problem. Reference URL: https://docs.ruby-lang.org/ja/search/

Tips Use the include? method.

include? The include? method is a method that determines whether the specified element is included in an array or character string. Screenshot 2020-08-14 16.50.22.png

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If there is (.) Or () in str, it is OK if you make a conditional branch with include? So that you can not register.

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