pls help with this programme

Task 1: Write a function that converts a distance from miles to kilometers 1. Write the header 2. Write sample calls and expected results for testing your function 3. Write the body of the function 4. Test your function in XCode Playground Account Task 2: Write a function that takes two strings as parameters, a first name and a last name, and returns a string consisting of last name followed by a comma, followed by a blank space, followed by the first name. 1. Write the header 2. Write sample calls and expected result for each to test your function 3. Write the body of the function 4. Test your function in XCode Playground nbox Task 3: Write a function that takes an array of doubles and returns the index of the largest value Help 1. Write the header 2. Write sample calls and expected result for each to test your function 3. Write the body of the function 4. Test your function in XCode Playground Type here to search