algos.js

/*Declare a function 'nextLexGreater' that takes a string as input and returns a modified version of the string. The function should rearrange the characters in the string in such a way that it produces the next lexicographically greater permutation of the characters. If such a permutation is not possible, the function should return the original string.
*/

function nextLexGreater(tring) {
  
}

console.log(nextLexGreater('oooooo'));	    // 'oooooo'
console.log(nextLexGreater('QRSTUVUTSRQ'));	// 'QRSTVQRSTUU'
console.log(nextLexGreater('yzxwvut'));	    // 'ztuvwxy'