fix: Use go fmt

Lint test.

num/num.go

@@ -2,12 +2,12 @@ package num
 
 func IsPrime(n int) bool {
 	if n <= 1 {
-		return false;
+		return false
 	}
 	for i := 2; i < n; i++ {
 		if n%i == 0 {
-			return false;
+			return false
 		}
 	}
-	return true;
+	return true
 }

num/num_test.go

@@ -3,8 +3,8 @@ package num
 import "testing"
 
 type checklist struct {
-	n int;
-	ret bool;
+	n   int
+	ret bool
 }
 
 func TestNum(t *testing.T) {