Find the index of the string "more powerful" and assign substringIndex with the index. Then, update wiseProverb replacing "more powerful" with "mightier".

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Find the index of the string more powerful" and assign substringlndex with the index. Then, update wiseProverb replacing "more powerful" with "mightier" 1 var wiseProverb "The pen is more powerful than the sword."; // Code wil1 be tested with "You are more powerful than you think." 2 var substringIndex 0; 4/*Your solution goes here*