What could cause my program to only read 2 lines of a 3 line input

I have a program that is supposed to take in a paragraph like

Testing#the hash#tag
#program!#when #beginning? a line
or #also a #comma,

and output something like

#the
#tag
#program
#when
#beginning
#also
#comma,

I feel like the logic makes sense, but obviously not because the program never seems to get into the line of input. The problem is almost definitely in the last source file below.

Here is the main source program

#include "HashTagger.h"
#include <string>
#include <iostream>
using namespace hw02;
using namespace std;

int main() {

  // Construct an object for extracting the
  // hashtags.

  HashTagger hashTagger;

  // Read the standard input and extract the
  // hashtags.

  while (true) {

    // Read one line from the standard input.

    string line;
    getline(cin, line);
    if (!cin) {
      break;
    }

    // Get all of the hashtags on the line.

    hashTagger.getTags(line);
  }

  // Print the hashtags.

  hashTagger.printTags();

  // Return the status.

  return 0;
}

my header file

#ifndef HASHTAGGER_H
#define HASHTAGGER_H

#include <string>

namespace hw02 {

class HashTagger {
public:
    void getTags(std::string line);

    void printTags();

private:

    std::string hashtags_;

};

}

#endif

and a source file the test in the source file seems to show that the program only gets to the second line and then stops before grabbing the last 2 hashtags

#include "HashTagger.h"
#include <iostream>
using namespace std;
using namespace hw02;

void HashTagger::getTags(string line) {

    // Loop over all characters in a line that can begin a hashtag
    int b = 0;
    string hashtags_ = "";
    for (unsigned int j = 0; j < line.length(); ++j) {
        char c = line.at(j);

        // if "#" is found assign beginning of capture to b
        if (c == '#') {
            b = j;

            // if the beginning is less than the end space, newline, ".", "?", or "!" found, add substring of the hashtag to hashtags_
        }
        if (b < j && (c == ' ' || c == '\n' || c == '.' || c == '?' || c == '!' )) {
            hashtags_ = hashtags_ + "\n" + line.substr(b, j - b + 1);
            b = 0;
            //Test// cout << b << "/" << j << "/" << c <<  "/" << hashtags_ << "/" <<  endl;
        }
    }
}

void HashTagger::printTags() {

    // print out hashtags_ to the console
    cout << hashtags_ << endl;
}