feat(util): add string reverser

utils/strings.go

@@ -0,0 +1,12 @@
+package utils
+
+import "bytes"
+
+func ReverseStringWithBuffer(input string) string {
+	var buffer bytes.Buffer
+	length := len(input) - 1
+	for i := length; i >= 0; i-- {
+		buffer.WriteByte(input[i])
+	}
+	return buffer.String()
+}