Mutate My Strings.js

/*
Description:
I will give you two strings. I want you to transform stringOne into stringTwo one letter at a time.

Example:

stringOne = 'bubble gum';
stringTwo = 'turtle ham';

Result:
bubble gum
tubble gum
turble gum
turtle gum
turtle hum
turtle ham
*/
function mutateMyStrings(One, Two){
  const s1 = One.split('');
  const s2 = Two.split('');
  const mutated = [s1.join('')];

  for(let i = 0; i < s1.length; i++) {
    if(s1[i] !== s2[i]) {
      s1[i] = s2[i];
      mutated.push(s1.join(''));
    }
  }
  return mutated.join('\n') + '\n';
}