Update challenge-1/submissions/yz4230/solution-template.go

Co-authored-by: coderabbitai[bot] <136622811+coderabbitai[bot]@users.noreply.github.com>

Author: yz4230

challenge-1/submissions/yz4230/solution-template.go

@@ -20,6 +20,9 @@ func main() {
 
 // Sum returns the sum of a and b.
 func Sum(a int, b int) int {
-	// TODO: Implement the function
+// Sum returns the sum of a and b.
+func Sum(a int, b int) int {
+	return a + b
+}
 	return a + b
 }