in C$++,$ given an array of capital letters, change the array so that every other letter is lowercase. Use a subtraction method and use only one return statement. do not add or change parameters and do not use static$\_$cast

example input:

$[$L$,$ V$,$ F$,$ D$,$ C$]$

example output:

$[$L$,$ v$,$ F$,$ d$,$ C$]$