function nameCase(str, LetterCase, invert) {
                let result = str.split('');
                if (LetterCase == 'upper') {
                    result.forEach(function(element, ind, arr) {
                        if (96 < element.charCodeAt(0) && element.charCodeAt(0) < 123) {
                            arr[ind] = String.fromCharCode(element.charCodeAt(0) - 32);
                        }
                    });
                    if (invert == true) {
                        result[0] = String.fromCharCode(result[0].charCodeAt(0) + 32);
                    }
                    return result.join('')
                }
                if (LetterCase == 'lower') {
                    result.forEach(function(element, ind, arr) {
                        if (64 < element.charCodeAt(0) && element.charCodeAt(0) < 90) {
                            arr[ind] = String.fromCharCode(element.charCodeAt(0) + 32);
                        }
                    });
                    if (invert == true) {
                        result[0] = String.fromCharCode(result[0].charCodeAt(0) - 32);
                    }
                    return result.join('')
                }
            }