$2$ Strings $(30$p$)$

Write down the function foo that finds the difference between the number of $\text{'}$a$\text{'}$s and $\text{'}z\text{'}$s in a string. Then complete the main function which will print one of the following:

$\text{'}a\text{'}$ appears $...$ times more in this string compared to $\text{'}z\text{'}.$

$\text{'}z\text{'}$ appears $...$ times more in this string compared to $\text{'}a\text{'}.$

The number of $\text{'}$a$\text{'}$s and $\text{'}z\text{'}$s are same in this string.

int foo$($char str$[])\{$