Problem $4$: Find and Replace

Write a program that reads a string and two characters $F$ and $R(F$ for Find and $R$ for Replace$).$ The main $()$

function then invokes find AndReplace $()$ fun ction th at replaces the $F$ ch aracter by the $R$ character and also

returns the number of replacements back to main$().$ The main$()$ then prints the result.

For your convenience, the function prototype is given below.

Function prototype: int findindReplace $($char $[],$ char F$,$ char R$)$;

Sample input $/$ output: