Moved string hashing function away from main files

lib/stringUtils.js

@@ -0,0 +1,14 @@
+function hashCode(string){
+	if(typeof string !== "string") throw "ERROR: Not a string";
+	var hash = 0;
+	if (string.length == 0) return hash;
+	for (let i = 0; i < string.length; i++) {
+		char = string.charCodeAt(i);
+		hash = ((hash << 5) - hash) + char;
+		hash = hash & hash; // Convert to 32bit integer
+	}
+	return hash;
+}
+module.exports = {
+	hashCode: hashCode,
+}