free/malloc fixes

vlib/strings/strings.v

@@ -5,9 +5,10 @@ pub fn repeat(c byte, n int) string {
 		return ''
 	}
 	mut arr := malloc(n + 1)
+	//mut arr := [byte(0); n + 1] 
 	for i := 0; i < n; i++ {
 		arr[i] = c
 	}
 	arr[n] = `\0`
-	return tos(arr, n)
+	return string(arr, n)
 }