This code not functioning on windows?

I have this code. The purpose of the code is to print everything before <img> and everything after </img>. Everything in between <img> and </img> should not be printed. However, I am having 2 issues.

1. The code is not compiling on windows (gcc compiler)?
2. The code is printing everything. It is even printing the <img>, </img> and everything in between.

Code:

FILE* fp = fopen("test.html", "r");

char* line;
size_t len;
ssize_t read;

bool found_tag = false;
int line_storer;
char* before_tag;
char* after_tag;

while ((read = getline(&line, &len, fp)) != -1) {
    if (
        ((before_tag = strstr(line, "<img>")) != NULL) &&
        ((after_tag = strstr(line, "</img>")) != NULL)
       ) {   
        line_storer = before_tag - line; 
        printf("%.*s", line_storer, line);

        printf("The Image use to be here\n");
        line_storer = after_tag - line + strlen("</img>"); 
        printf("%s", line + line_storer);

    } else if ((before_tag = strstr(line, "<img>")) != NULL) {
        line_storer = before_tag - line; 
        printf("%.*s", line_storer, line);

        found_tag = true;

    } else if((after_tag = strstr(line, "</img>")) != NULL) {
        found_tag = false;

        line_storer = after_tag - line + strlen("</img>"); 
        printf("%s", line + line_storer);

    } else if(!found_tag) {
        printf("%s", line);
    }
}

fclose(fp);

---

test.html:

<b>This is a test page</b>
<div class=back1>Some more text here for more testing!!!!</div>
<img>www.website.com/image.png</img>
The Image use to be here
<i>More words</i>
<u><i><b>TESTING 123</u></i></b>

---

output:

<b>This is a test page</b>
<div class=back1></div>
The Image use to be here
<i>More words</i>
<u><i><b>TESTING 123</u></i></b>

---

Assumptions:

There will only be one <img>
There will only be one </img>. The </img> tag will always be after the <img>