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Masters of the Universe Coding Assignment

As a business user I need a tool that reads an accounting log in csv format that sums up all amounts per account_id and month and outputs a csv with summaries so we can double check the bookings easily.

Acceptance Criteria

the tool accepts 2 file names (input and output)
output is a csv file with following fields
- MONTH - the month of the booking in format yyyy/mm
- ACCOUNT_ID - an ACCOUNT_ID from the input file
- SUM_OF_AMOUNT - the sum of all input amounts for a ACCOUNT_ID per MONTH
empty lines in the input file are ignored
the amount from the input is summed up, grouped by ACCOUNT_ID and MONTH

Format for the input csv

separator is a comma ','
the file has a header line
there are no quotes used
there can't be a comma in one of the fields
the file may contain empty lines (no character or just white spaces)
the file is encoded in UTF-8 without BOM marker
the file has 4 columns
- TIME_STAMP - time of booking in format yyyy-mm-dd hh:mi:ss
- ACCOUNT_ID - Integer number
- EMPLOYEE - String (name of employee)
- AMOUNT - floating point number

Sample files:

good_input.csv - a sample input file that has no validation error
good_output.csv - expected output from processing good_input.csv

Nice to have

the tool writes a error file with rejected records
the header and each line is checked for the expected number of columns
every field is trimmed from whitespace
input record validation is done
- no field may be empty after trimming
- TIME_STAMP must be in expected format
- only valid ACCOUNT_ID are accepted, list of IDs:
  - 10101
  - 10302
  - 10506
  - 10780
input lines that are rejected in validation are written to an error csv file
the error records have an additional column with a reason for being rejected

Sample files for 'Nice to have':

input_with_error.csv - a sample input file that has all kinds of validation problems
input_with_error_output.csv - expected output from processing input_with_error.csv

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