hath | Rewrite HentaiAtHome client with Golang

First post ever, after lurking for some weeks. I'm currently attending a full-stack bootcamp and recently we got into Javascript (so I'm extremely green, please be patient...I'm trying to reskill myself in another industry). One of the HLTs that is giving me a particular headache is as follows:

You are tasked with creating re-usable methods that can be used throughout the business. The business needs you to create methods for mathematics operations. Follow the instructions below:

1. Ask the user for a number with a prompt() and store the value in a variable called firstValue
2. Ask the user for a second number with a prompt()and store that value in a variable called secondValue
3. Ask the user for a third input with prompt()storing the value in a variable called operation. >Expected operations are: a.+This is the addition symbol, located next to the backspace key(hold shift) b.–This is the subtraction symbol, located next to number 0key (hold shift) c./This is the division symbol, a forward slash, located next to the full stop key d.*This is the multiplication symbol, a star, accessed by holding shift and pressing number 8 e.^This is the to-the-power-of symbol, known as a caretin programming, accessed by holding shift and pressing the number 6
4. Write a method for the 5 operations listed above (one for each operation) that takes in both valuesand returns the result of the operation.a.For examplefunction multiplication(firstValue, secondValue) { return firstValue * secondValue;}
5. Create a case-switch for evaluating the operation the user supplied, and depending on the value, execute the relevant function.
6. Print out to consolefirstValue, operator, secondValue, an equal sign, and the answer: a.2 x 8 = 16 STRETCH CHALLENGE: Wrap the code in a continuous loop that only ends when the user responds to a prompt that asks them “would you like to do another calculation?”with their answer being “no”. STRETCH CHALLENGE: Change the above code to also include methods for processing sin, cos, and tan. You can use the methodsMath.sin(x), Math.cos(x), Math.tan(x)but be aware thatthe user only needs to supply a single value and the operation they wish to dowhen needing sin, cos, and tan!

I'm stuck even before attempting the stretch challenges (which I have no clue on how to do, but that's a problem for later) and looking online I couldn't find anything helpful (since most calculators employ HTML and CSS as well). Here below my two attempts at making the code work (I made multiple variations of both, trying to find a version that worked, but without any luck). I used some Shakespearean English, just to spice it up and to make it less boring. Also, it's called "Calculathor".

First attempt: