Write a C program, in which you define a function without any parameter. The function randomly

returns an English letter character. The probability of the lowercase letters must be the double than the probability of uppercase letters. $($The character should not be the same for each run.$)$ Call the function in the main program unit and print the returned value. $($Hint: $\text{'}a\text{'}$ is $97$ and $\text{'}A\text{'}$ is $65.)$