You are given a sentence containing words separated by single spaces and a searchWord. Your task is to determine whether searchWord is a prefix of any word in the sentence.
Return the 1-based index of the first word in which searchWord appears as a prefix.
If searchWord is a prefix of multiple words, return the index of the earliest such word.
If no word starts with searchWord, return −1.
A prefix of a string is any contiguous substring that begins at the first character.
Constraints: