I have fixed the mistakes according to the feedabck.

Author: Seti-Jemal

Sprint-2/2-mandatory-debug/0.js

@@ -2,7 +2,7 @@
 
 // =============> write your prediction here
 // The program will print 320 first.
-// Then it will " The result of mutiplying 10 and 32 is undefined".
+// Then it will " The result of mutiplying 10 and 32 is 320".
 
 
 function multiply(a, b) {
@@ -23,4 +23,5 @@ console.log(`The result of multiplying 10 and 32 is ${multiply(10, 32)}`);
 function multiply(a,b){
   return a*b;
   }
+  
   console.log(`The result of multiplying 10 and 32 is ${multiply(10, 32)} `);

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

@@ -16,5 +16,7 @@
 // This might help https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/toUpperCase
 
 function convertToUpperSnakeCase(str) {
-  return str.toUpperCase().trim().split("").join("_");
+  return str.toUpperCase().trim().split(" ").join("_");
 }
+
+console.log(convertToUpperSnakeCase("hello there")); // "HELLO_THERE"

Sprint-2/3-mandatory-implement/3-to-pounds.js

@@ -5,7 +5,22 @@
 
 // You should call this function a number of times to check it works for different inputs
 
-function toPounds(kilograms) {
-  const pounds = kilograms * 2.20462;
-  return Number(pounds.toFixed(2));
-}
+const toPounds = (kg) => +(kg * 2.20462).toFixed(2);
+
+const penceToPounds = (p) => `£${(p / 100).toFixed(2)}`;
+const toUpperSnakeCase = (s) => s.toUpperCase().trim().split(" ").join("_");
+const multiply = (a, b) => a * b;
+
+// Tests
+console.log(toPounds(10)); // 22.05
+
+console.log(penceToPounds(150)); // "£1.50"
+
+console.log(toUpperSnakeCase("hello there"));
+// "HELLO_THERE"
+console.log(multiply(10, 32)); // 320
+
+const convertToUpperSnakeCase = (str) =>
+  str.toUpperCase().trim().split(" ").join("_");
+
+console.log(convertToUpperSnakeCase("hello there")); // "HELLO_THERE"

Sprint-3/1-implement-and-rewrite-tests/implement/2-is-proper-fraction.js

@@ -30,4 +30,4 @@ function assertEquals(actualOutput, targetOutput) {
 // What combinations of numerators and denominators should you test?
 
 // Example: 1/2 is a proper fraction
-assertEquals(isProperFraction(1, 2), true);
+assertEquals(isProperFraction(1, 2), true);