Returns a JSON string that is a response to a currency query.

A currency query converts amt money in currency src to the currency dst$.$ The response

should be a string of the form

$\text{'}\{"$success$"$: true, $"$src$"$: $"","$dst$"$: $"",$ "error": $""\}\text{'}$

where the values src$-$amount and dst$-$amount contain the value and name for the src

and dst currencies, respectively. If the query is invalid, both src$-$amount and

dst$-$amount will be empty, and the error message will not be empty.

There may or may not be spaces after the colon. To test this function, you should

choose specific examples from your web browser.

Parameter src: the currency on hand

Precondition: src is a nonempty string with only letters

Parameter dst: the currency to convert to

Precondition: dst is a nonempty string with only letters

Parameter amt: amount of currency to convert

Precondition: amt is a float or int

Can you help me write a function for this without using IF and includes introcs. urlread