Palindrome checker function

int isPalindrome(char* wordPtr){
    char* endPtr;
    int len;

    // Point to the end
    for(int i=0; i<20; ++i){
        if(wordPtr[i]==0){
            endPtr = &(wordPtr[i-1]);
            len = i;
            break;
        }
    }

    // Iterate from both sides
    for(int i=0; i<(len/2); ++i){
        printf("%c == %c\n", wordPtr[i], *endPtr);
        if(wordPtr[i] != *endPtr){  // Check if same
            return 0;
        } else {
            endPtr -= 1;
        }
    }

    return 1;
}