Implement toUpperSnakeCase function to convert strings to UPPER_SNAKE_CASE with input validation

Author: moses77-boop

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

@@ -14,3 +14,10 @@
 // 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 toUpperSnakeCase(input){
+    if (typeof input !== "string"){
+        throw new Error("Input must be a string")
+    }
+    return input.trim().split(/\s+/).join("_").toUpperCase();
+}