cloudManager

function cloudManager(input) {   debugger;
    var result = {};

    for (var i = 0; i < input.length; i++) {
        var line = input[i].split(' ');
        var name = line[0];
        var extension = line[1];

        var memory1 = parseFloat(line[2]);
        if (!(extension in result)) {
            result[extension] = {names: [], memory: []};
        }
        if (result[extension].names.indexOf(name) == -1) {
            result[extension].names.push(name);
        }

        result[extension].memory.push(memory1);
    }
    var output = {};
        var sortedExtensions = Object.keys(result).sort();
        for (var e in sortedExtensions) {
            var fileType = sortedExtensions[e];
            var fileInfo = {
                files: result[extension].names.sort(),
                 memory: totalMemory(result[extension].memory)
            }
            output[fileType] = fileInfo;

    }
    function totalMemory(arr)  {
        var sum = 0;
        for (var i in arr) {
                        sum += arr[i];
                    }
        return sum.toFixed(2);

    }
    console.log(JSON.stringify(output));
}
cloudManager(['sentinel .exe 15MB',
'zoomIt .msi 3MB',
'skype .exe 45MB',
'trojanStopper .bat 23MB',
'kindleInstaller .exe 120MB',
'setup .msi 33.4MB',
'winBlock .bat 1MB'])