sheldon j. plankton is on a mission. he is approaching people on the street and asking them to write asentence of their choice on a notepad. he is then going to generate statistics on the sentences. he wantsto know the number of vowels, the number of characters that appear in both cases, and to check if thestring contains a hexadecimal number. however, he is completely out of his depth with string processingand has just hired you to write a c program for him.
