refactor math utility

src/commonMain/kotlin/com/infendro/hash/util/Math.kt

@@ -1,7 +1,6 @@
 package com.infendro.hash.util
 
-internal fun ceil(x: Int, n: Int): Int =
-    ((x + n - 1) / n) * n
-
-internal fun ceilPow2(x: Int, n: Int): Int =
-    (x + n - 1) and (n - 1).inv()
+internal fun Int.align(n: Int): Int = when {
+    n and (n - 1) == 0 -> (this + n - 1) and (n - 1).inv()
+    else -> ((this + n - 1) / n) * n
+}