It needs to be organized and modifications need to be made to it (as well as improve the commenting and styling of the code).

if your last name matches [a-i].* : your assignment is to modify this program so that it prints out the most frequent letter and most frequent digit. (you may want to use the c library functions isdigit() and

if your last name matches [j-q].*: your assignment is to modify this program so that it prints out the five most frequent characters.

if your last name matches [r-z].* : your assignment is to modify this program so that it prints out the most and least frequent characters, but least frequent means that appeared on the input. if there are no qs on the input, it is incorrect to print that q appears zero times.