give string s consist character b return true appear b string otherwise return false example 1input s aaabbboutput trueexplanationthe index 0 1 2 bs index 3 4 5hence appear b return trueExample 2input s ababoutput falseExplanationThere index 2 b index 1hence appear b return falseexample 3Input s bbboutput trueexplanationthere appear b return true Constraints1 slength 100si b