$$ Define function called percentage, given a string and a character, return the percentage of number of appearances of the character to the total number of characters of the string. $$ In main function, call the function on string "abcdab", and $\text{'}$a$\text{'}.$ Note that alphabetic characters are case$-$sensitive$,$ so $\text{'}$a$\text{'}$ is different from $\text{'}$A$\text{'}.$ Examples: If the input string is "abcBba", and the character is $\text{'}$b$\text{'},$ return $333\mathrm{.}3333.$ If the input string is $"$ab$",$ and the character is $\text{'}$a$\text{'},$ return $50.$ If the input string is "abcdf', and the character is $\text{'}$e$\text{'},$ return $0.$