In C language please,

1. Get the user's first name and store it to a char array
   • Declare a character array to hold at least 20 characters.
   • Ask for the user's firstname, and store the name into your char array.
2. Get 5 test scores from the user :
   • Declare an array of 5 floating point elements.
   • Use a for loop to get the user's 5 scores.
     • Assume that all scores are out of 100. You are not required to request the maximum score.
     • Assume that the user input is valid. You are not required to validate user input.
   • Your prompts should print out which test score you are asking for:
     • Example: "What is the score of test #1?" ... "What is the score of test #3?"
   • Warning: Be careful of your array indexes!
3. Calculate the average test score:
   • Use a for loop to calculate the sum of all examinations.
   • Divide the sum by 5 to get the average and store this data in another variable.
4. Print the summary for the user similar to:
   • "Hello Charley, based on your test scores of 80, 75, 90, 85 and 100, your average is 86.00% with letter grade of an 'B'"
   • You should re-use your previous code to calculate the grade letter from the average percentage.