Finish the last exercise of the section 3 sprint course work and ready for the PR

Author: Jacknguyen4438

Sprint-1/3-mandatory-interpret/3-to-pounds.js

@@ -24,4 +24,31 @@ console.log(`£${pounds}.${pence}`);
 // Try and describe the purpose / rationale behind each step
 
 // To begin, we can start with
-// 1. const penceString = "399p": initialises a string variable with the value "399p"
+/* 
+1. const penceString = "399p": initializes a string variable with the value "399p".
+
+2. const penceStringWithoutTrailingP: this variable is now store a new value of penceString "399".
+By using the .substring method(.slice method predecessor)it remove the p from the penceString value and 
+reassign the new value to variable penceStringWithoutTrailingP. It start from index position 0 in this case "3" and stop at the index 2 "9".
+
+3. const paddedPenceNumberString: this variable main role is to check if the string value total length 
+at least 3, if the length short then padStart will add 0 the left from the first index(0) in this case "3" until the string length total is 3. In this case 
+it select the string number "3".
+
+4. const pounds: this variable is role is to extract the pound value from the paddedPenceNumberString.
+Inside the the paddedPenceNumberString subString method parameter it have 2 value 0 and paddedPenceNumberString total string length minus 1,
+the 0 is the index of the  string number that we would like to start while .length - 2 is to tell the SubString method where to stop in this case the  first "9".
+
+5) const pence: as the name suggest this variable main role is to extract he pence value from the paddedPenceNumberString variable.
+How ever this variable there are 2 method is used.
+ -subString method is used to slice the string value "99" off the "399" value, how ever is now only have 1 value
+ is the length of the "399" is 3 now - 2 equal to 1 and no end value. The main reason is to select where the slice will begin stop at the end 
+ of the string.
+ -padEnd method work exactly the same as padStart but in reverse. The padEnd method is checking to see is the paddedPenceNumberString string length at least total of 2, 
+ if not they will add 0 from the selected index position from the string value "99" from the index 0 in this case is "9" to the right.
+
+6)console.log(`£${pounds}.${pence}`): is to log and print out the value inside the terminal by using the string template, the back tick is to 
+define a template literal. Then inside the template the pound sign(£) is show the pound currency, the money sign before the curly bracket is to allow 
+embed variables in this case pounds and pence that separate by dot that print out a float string value.
+*/
+