Have the function NonrepeatingCharacter(str) take the str parameter being passed, which will contain only alphabetic characters and spaces, and return the first non-repeating character.
For example: if str is agettkgaeee then your program should return k. The string will always contain at least one character and there will always be at least one non-repeating character.
Input: "abcdef"
Output: a
Input: "hello world hi hey"
Output: w
Run the rake command from the terminal to run the automated tests.