Given two strings s and goal, return true if you can swap two letters in s so the result is equal to goal, otherwise, return false.
Swapping letters is defined as taking two indices i and j (0-indexed) such that i != j and swapping the characters at s[i] and s[j].
For example, swapping at indices 0 and 2 in "abcd" results in "cbad".
1 <= s.length, goal.length <= 2 * 10^4s and goal consist of lowercase letterss = "ab", goal = "ba"trues = "ab", goal = "ab"falses = "aa", goal = "aa"true