Design a combinational circuit for letter case conversion. The circuit should have the following

attributes.

$$ There must be a control input C$.$

$$ If C $=1$

o Conversion from lower case to upper case must be done.

o If the input is a lower$-$case letter, then output should be an upper$-$case letter.

o If the input is an upper$-$case letter, then output should be an upper$-$case letter

$$ If C $=0$

o Conversion from upper case to lower case must be done.

o If the input is an upper$-$case letter, then output should be a lower$-$case letter.

o If the input is a lower$-$case letter, then output should be a lower$-$case letter.