GALAXY MERCHANT TRADING GUIDE

Problem Description

You decided to give up on earth after the latest financial collapse left 99.99% of the earth's population with 0.01% of the wealth. Luckily, with the scant sum of money that is left in your account, you are able to afford to rent a spaceship, leave earth, and fly all over the galaxy to sell common metals and dirt (which apparently is worth a lot). Buying and selling over the galaxy requires you to convert numbers and units, and you decided to write a program to help you.The numbers used for intergalactic transactions follows similar convention to the roman numerals and you have painstakingly collected the appropriate translation between them. Roman numerals are based on seven symbols:

Symbol	Value
I	1
V	5
X	10
L	50
C	100
D	500
M	1,000

Numbers are formed by combining symbols together and adding the values. For example, MMVI is 1000 + 1000 + 5 + 1 = 2006. Generally, symbols are placed in order of value, starting with the largest values. When smaller values precede larger values, the smaller values are subtracted from the larger values, and the result is added to the total. For example MCMXLIV = 1000 + (1000 − 100) + (50 − 10) + (5 − 1) = 1944.

The symbols "I", "X", "C", and "M" can be repeated three times in succession, but no more. (They may appear four times if the third and fourth are separated by a smaller value, such as XXXIX.) "D", "L", and "V" can never be repeated.

"I" can be subtracted from "V" and "X" only. "X" can be subtracted from "L" and "C" only. "C" can be subtracted from "D" and "M" only. "V", "L", and "D" can never be subtracted.

Only one small-value symbol may be subtracted from any large-value symbol.

A number written in Arabic numerals can be broken into digits. For example, 1903 is composed of 1, 9, 0, and 3. To write the Roman numeral, each of the non-zero digits should be treated separately. In the above example, 1,000 = M, 900 = CM, and 3 = III. Therefore, 1903 = MCMIII.

Source: Wikipedia

Sample Input

glob is I
prok is V
pish is X
tegj is L
glob glob Silver is 34 Credits
glob prok Gold is 57800 Credits
pish pish Iron is 3910 Credits
how much is pish tegj glob glob ?
how many Credits is glob prok Silver ?
how many Credits is glob glob Gold ?
how many Credits is glob glob glob glob glob glob Gold ?
how many Credits is pish tegj glob Iron ?
Does pish tegj glob glob Iron has more Credits than glob glob Gold ?
Does glob glob Gold has less Credits than pish tegj glob glob Iron?
Is glob prok larger than pish pish ?
Is tegj glob glob smaller than glob prok ?
how much wood could a woodchuck chuck if a woodchuck could chuck wood ?

Sample Output

pish tegj glob glob is 42
glob prok Silver is 68 Credits
glob glob Gold is 28900 Credits
Requested number is in invalid format
pish tegj glob Iron is 8015.5 Credits
pish tegj glob glob Iron has less Credits than glob prok Gold
glob glob Gold has more Credits than pish tegj glob glob
glob prok is smaller than pish pish
tegj glob glob is larger than glob prok
I have no idea what you are talking about

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Solution

This solution is built using go 1.20. This app will read input file in the root directory. Currently, the input file only supported lowercase characters except metals (Gold, Silver, Iron) and Credits keywords. Currently suppport incase-sensitive format for input.

Input file Rules

1. All characters must be in lowercase except for metal names and Credits keywords Currently, support incase-sensitive format
2. Roman number only supported between 1 to 3999
3. Metal only supported Gold, Silver, and Iron

Example Input

glob is I
prok is V
pish is X
tegj is L
glob prok Gold is 57800 Credits
glob glob Silver is 34 Credits
pish pish Iron is 3910 Credits
how much is pish tegj glob glob ?
how many Credits is glob prok Silver ?
how many Credits is glob glob Gold ?
how many Credits is glob glob glob glob glob glob Gold ?
how many Credits is pish tegj glob Iron ?
does pish tegj glob glob Iron has more Credits than glob glob Gold ?
does glob glob Gold has less Credits than pish tegj glob glob Iron ?
is glob prok larger than pish pish ?
is tegj glob glob smaller than glob prok ?
how much wood could a woodchuck chuck if a woodchuck could chuck wood ?

Example Output

pish tegj glob glob is 42
glob prok Silver is 68 Credits
glob glob Gold is 28900 Credits
Requested number is in invalid format
pish tegj glob Iron is 8015.5 Credits
pish tegj glob glob Iron has less Credits than glob prok Gold
glob glob Gold has more Credits than pish tegj glob glob
glob prok is smaller than pish pish
tegj glob glob is larger than glob prok
I have no idea what you are talking about

How to Run

1. Clone the repository
2. Run make tools
3. Run make dependencies
4. Place your input to input file at the root directory
5. Run make run-local to run the app

Folder Structure

├── cmd                     
│   └── app                 -> entry point for the app
├── internal                 
│   ├── app                 -> app main function folder
│   └── pkg                 
│       ├── converters      -> converter for numbers (alien, roman, arabic)
│       │   ├── mocks       -> converter mock for unit testing
│       ├── parsers         -> parser for parsing input
│       │   ├── mocks       -> parser mock
│       └── readers         -> encapsulation file reader
│           └── mocks       -> reader mock