//INCOMPLETE

/** You are given two strings.

*In a single move, you can choose any of them,

*and delete the first (i.e. leftmost) character.e

*/

/** By applying a move to the string "where", the result is the string"here"`.

* By applying a move to the string "a", the result is an empty string""`.

*/

// TESTS

let testStr1 = 'test'; // 2

let testStr2 = 'west';

let testStr3 = 'test'; // 7

let testStr4 = 'yes';

// may remove the b first and not know it's in next string,

let testStr5 = 'b'; // 1

let testStr6 = 'ab';

function shiftLeft(s, t) {

//string holders

let str1 = s;

let str2 = t;

let len = str1.length + str2.length;

// create boolean flag to alterante between moves on strings.\

let strTurn = str1.length >= str2.length ? true : false;

// create moves counter.

let turnCount = 0;

// create a function that deletes a character from beginning and makes it the new version of the string.

// will assign value to str vars via return

function removeCharAndUpdateStr(string) {

string = string.replace(string[0], '');

turnCount++;

strTurn = !strTurn;

return string;

}

for (let i = 0; i < len; i++) {

// tests the strings for eqaulity or for no more characters.

if ((str1 === str2) || (str1 === '') || (str2 === '')) {

return turnCount;

}

if (strTurn) {

str1 = removeCharAndUpdateStr(str1);

continue;

} else {

str2 = removeCharAndUpdateStr(str2);

continue;

}

}

return turnCount;

}

console.log(shiftLeft(testStr5, testStr6));