Messing around with Javascript

names.js

var fullName = "";
var firstLetter;
/*
   fixName function definition should go here.
*/
var fixName = function(name, nameType) {
    /***** Begin repeated code block *****/
    var appendString;
    firstLetter = name.substring(0, 1);
    appendString = firstLetter.toUpperCase() + name.substring(1);
    switch(nameType){
        case "first":
        case "last":
            appendString = firstLetter.toUpperCase() + name.substring(1);
            break;
        case "middle":
            appendString = firstLetter.toUpperCase();
            break;
    }
    fullName = fullName + " " + appendString;
    /***** End repeated code block *****/
};
var firstName = prompt("Enter your first name (all in lower case):");
fixName(firstName, "first");

var middleName = prompt("Enter your middle name (all in lower case): ")
fixName(middleName, "middle");

var lastName = prompt("Enter your second name (all in lower case):");
fixName(lastName, "last");

console.log("And your full name is:" + fullName);