circular-sentence.java

class Solution {
    public boolean isCircularSentence(String s) {
        if(s.charAt(0)!=s.charAt(s.length()-1)){
            return false;
        }
        int k=s.indexOf(" ");
        if(k==-1){
            return true;
        }
        while(k!=-1){
            if(s.charAt(k-1)!=s.charAt(k+1)){
                return false;
            }
            // Find the next space in the string, starting from position after current space
            k=s.indexOf(" ",k+1);
        }
        return true;
    }
}