Feat: done

reverse.go

@@ -0,0 +1,31 @@
+package reverse
+
+import "unicode/utf8"
+
+func swap(a *byte, b *byte) {
+	*a ^= *b
+	*b ^= *a
+	*a ^= *b
+}
+
+func reverse(b []byte) {
+	for i := 0; i < len(b); {
+		_, sz := utf8.DecodeRune(b[i:])
+		l := i
+		r := i + sz - 1
+		for l < r {
+			swap(&b[l], &b[r])
+			l++
+			r--
+		}
+		i += sz
+	}
+
+	l := 0
+	r := len(b) - 1
+	for l < r {
+		swap(&b[l], &b[r])
+		l++
+		r--
+	}
+}