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Total currencies are not more than 10, each currency has a unique name, for example "EUR", "USD", "CAD" and
Etc.
The program must implement two functions available to an external user:
Void setExchangeRate (string first_currency, string second_currency, double exchange_rate);
Double getExchangeRate (string first_currency, string second_currency);
The first method will be called frequently (hundreds of times per second) to update the current values
Conversion rates.
The second method will be called if necessary to get the current rate between the currencies.
The method must issue an exchange rate if it exists (for example, EUR -> USD -> CAD), otherwise
0. The shortest way to consider is always the most profitable, i.e. EUR -> CAD (if it exists) always
Better EUR -> USD -> CAD.
At the very beginning, assume that nothing can be converted until the corresponding
Values are supplied in the first method.
Exchange between currencies in both directions is made without transaction losses, bid is ask.
For example, if you set the conversion EUR -> USD = 1.25, then you can use the opposite: USD ->
EUR = 0.8
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