moved files into src directory

Author: carlogy

src/calculator.ico

@@ -0,0 +1,46 @@
+function add(num1, num2) {
+  return num1 + num2;
+}
+function subtract(num1, num2) {
+  return num1 - num2;
+}
+function multiply(num1, num2) {
+  return num1 * num2;
+}
+function divide(num1, num2) {
+  return num1 / num2;
+}
+
+function tipFormCalc(total, splitByNumber, tipPercetage) {
+  let subTotal = multiply(total, add(1, divide(tipPercetage, 100)));
+
+  return splitByNumber !== 0 ? divide(subTotal, splitByNumber) : subTotal;
+}
+
+function discountFormCalc(itemPrice, discountPercentage, taxPercentage) {
+  //to do review feedback received on the calc!
+  let discountSubTotal = divide(
+    itemPrice,
+    add(1, divide(discountPercentage, 100)),
+  );
+
+  return multiply(discountSubTotal, add(1, divide(taxPercentage, 100)));
+}
+
+function calculate(num1, operation, num2) {
+  try {
+    return operation(num1, num2);
+  } catch (error) {
+    console.log(error);
+  }
+}
+
+export {
+  add,
+  subtract,
+  multiply,
+  divide,
+  tipFormCalc,
+  discountFormCalc,
+  calculate,
+};