dollars

Data manipulation / coding challenge that a friend was given for an interview question. Thought it would be fun to attempt to implement and a good excuse to take a new language (Crystal) for a spin.

Original brief and requirements:

Write a function (dollars) that accepts a String and returns a String. It will accept a numeric value as input, representing an amount of money, and the function will convert that value to its how it is written in English. Use any preferred programming language. For example, the input "1.11" will result in a return value of "one dollar and eleven cents"

Invalid characters should be ignored, meaning that every input string has an output string. The empty string produces "zero dollars and zero cents"

Some other example input and output:

dollars "0" => "zero dollars and zero cents"

dollars "1" => "one dollar and zero cents"

dollars "0.1" => "zero dollars and ten cents"

dollars "1." => "one dollar and zero cents"

dollars "0." => "zero dollars and zero cents"

dollars ".34" => "zero dollars and thirty-four cents"

dollars "0.3456789" => "zero dollars and thirty-four cents"

dollars "1.0" => "one dollar and zero cents"

dollars "1.01" => "one dollar and one cent"

dollars "1000456.13" => "one million four hundred and fifty-six dollars and thirteen cents"