char$*$ removeExtraRs$($char $*$str$)$

This function returns a dynamically allocated new string which removes all but the last three r$\text{'}$s from the given string $($both lower and upper case r$\text{'}$s$).$ Some simple examples:

removeExtraRs$("$RrRrRrRr$")$ should return the string $"$rRr$"$

remoneExtraRs$("$Rarer$-$strawberries"$)$ should return the string $"$ac$-$strawberries"

removeExtraRs$("$Nothing$\_$to$\_$do$")$ should return the string "Nothing$\_$to$\_$do$"$

Some additional requirements for your remove Extrals function:

The new string should have exactly enough size to store the chars in a string and a null terminator $($i$.$e$.,$ don't malloc more memory than you need$).$ Remember that $\text{'}10\text{'}$ is the null terminator character which ends a string.

The only functions your removeExtraRs implementation should call are countRs, malloc, sizeof, strlen, and max $($this finds the larger of two numbers$).$

$($a$)(2$ points$)$ Complete the following helper function which finds the number of r$\text{'}$s $($both upper and lower case$)$ in the given string:$//$Find the number of r$\text{'}$s $($both upper and lower case$)$ in str$//$Hint: use a loop, You can call strlen to find the length of str$,$