implemented function that turns a string in to upper snake case

Author: alexandru-pocovnicu

Sprint-2/3-mandatory-implement/2-cases.js

@@ -14,3 +14,7 @@
 // You will need to come up with an appropriate name for the function
 // Use the MDN string documentation to help you find a solution
 // This might help https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/toUpperCase
+function upperSnakeCase(str){
+    return str.toUpperCase().split(" ").join("_")
+}
+