Must be written in C using while, do-while loop

Problem 2: Write a program with the file name lab5_problem2.c that asks the user to enter a sentence ended by a period and prints out the number of times each character appears in the sentence, only for the characters that occur at least once. Uppercase and lowercase version of a letter should be counted toward the same letter. The program should function as follows (the items underlined are to be entered by the user): Enter a sentence (end by .') : Tnis is a short sentence. Occurrences of 'a': 1 Occurrences of : 1 Occurrences of 'e: 3 Occurrences of ' 2 Occurrences of 'i 2 Occurrences of ' 2 Occurrences of o: 1 occurrences of 'r': 1 Occurrences of 's': 4 Occurrences of 't 3 Algorithm design process 1. What variables are needed and what type? a. A variable to store the character entered by the user. b. An array of integers to store the number of occurrences for each character What should be the size of the array? How many characters there are in the alphabet? Don't forget to properly initialize the array - with what should we initialize it? c. Any other variables that you need? Maybe an integer counter used in a loop to print the number of occurrences at the end. 2. Get input from user a. Prit out the text to prompt the user b. Set up a loop (while, do-while) to read in character by character until a-, is found. 3. Inside the loop In order to handle upper/lower case situations, we should convert each character read to lowercase (use the tolower function from the string library). For every character read, increment the corresponding value in the occurrences array. How do we find the index associated with each character? Hint: character a. b. a' should be associated with the first element of the array (index 0), character 'b, with index 1 and so on. we can get the index by subtractinga, from the value of the current character. This index can now be used to properly increment the values in the occurrences array 4. Print the results. Set up a for loop that iterates through the occurrences array and prints out the statistics. How do we print the . a, ,b. c, letters in the output string? we can obtain the character by adding the value of the index to character a, (this is the offset value for all the subsequent letters). Thus 0 wl become 'a',1 will be b, and so on. a