replace zxq.co/ripple/hanayo

vendor/github.com/felipeweb/gopher-utils/math.go

@@ -0,0 +1,15 @@
+package gopher_utils
+
+// PowInt is int type of math.Pow function.
+func PowInt(x int, y int) int {
+	if y <= 0 {
+		return 1
+	} else {
+		if y%2 == 0 {
+			sqrt := PowInt(x, y/2)
+			return sqrt * sqrt
+		} else {
+			return PowInt(x, y-1) * x
+		}
+	}
+}