map example fix

I am not sure what the intention was with the countyCode code, but to get the output in the example, it should be written this way

09_Day/09_day_higher_order_functions.md

@@ -241,9 +241,7 @@ const countries = [
   'Kenya'
 ]
 const countriesToUpperCase = countries.map(function(country){
-  let countryCode = country.toUpperCase().slice(0, 3)
-  let country = country.length
-  return []
+  return country.toUpperCase();
 })
 console.log(countriesToUpperCase)
 // ['ALBANIA', 'BOLIVIA', 'CANADA', 'DENMARK', 'ETHIOPIA', 'FINLAND', 'GERMANY', 'HUNGARY', 'IRELAND', 'JAPAN', 'KENYA']
@@ -581,4 +579,4 @@ console.log(users); // sorted ascending
 
 🎉 CONGRATULATIONS ! 🎉
   
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+[<< Day 8](https://github.com/Asabeneh/30DaysOfJavaScript/blob/master/08_Day/08_day_objects.md) | [Day 10 >>](#)