please follow instructions. code in c. follow example

Vrite a program that encodes the input characters using the following algorithm. - If the input character is a digit (' 0 ' through ' 9 '), then output the digit by adding 6 to the digit and calculate the remainder by 10 . For example, if a digit is ' 6 ', then replaced digit is ' 2 '. - Subtract the digit with ' 0 ', add 6 , and then calculate the remainder by 10 , then add ' 0 '. - If the character is an alphabetic letter, then shift the letter by 6. For example, if the letter is ' B ', then the letter becomes 'H'. - Subtract the letter with 'a' (for lower case) or 'A' (for upper case), add 6 , and then calculate the remainder by 26 , then add ' a ' (for lower case) or 'A' (for upper case). For example, 'X' shifted by 6 is ' '. - If the character is a white space, skip it. - If the character is not a digit, an alphabetic letter, or a white space, output the underscore ' ' character. - Follow the format of the examples below. - Use the getchar() function to read the input. Do not use scanf. - The user input ends with the user pressing the enter key (a new line character). - Character handling library functions in ctype.h is allowed