exercise1

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Overview

Declare an interface named speaker with a method named sayHello. Declare a struct named English that represents a person who speaks english and declare a struct named Chinese for someone who speaks chinese. Implement the speaker interface for each struct using a value receiver and these literal strings "Hello World" and "你好世界". Declare a variable of type speaker and assign the _address of_ a value of type English and call the method. Do it again for a value of type Chinese.

Add a new function named sayHello that accepts a value of type speaker. Implement that function to call the sayHello method on the interface value. Then create new values of each type and use the function.