C programming: please explain the following code line by line, the more explanation the better. Thank you.

if ( fp1 != NULL )

{

char line[256];

while ( fgets ( line, sizeof line, fp1 ) != NULL )

{

char * tokenize = strtok(line, "\"");

to_lower(tokenize);

if ( strstr(tokenize, STOCK TKR_ )) {

tokenize = strtok(NULL, "\"");

tokenize = strtok(NULL, "\"");

name = strdup(tokenize);

tokenize = strtok(NULL, "\"");

tokenize = strtok(NULL, "\"");

tokenize = strtok(NULL, "\"");

tokenize = strtok(NULL, "\"");

tokenize = strtok(NULL, "\"");

tokenize = strtok(NULL, "\"");

tokenize = strtok(NULL, "\"");

tokenize = strtok(NULL, "\"");

tokenize = strtok(NULL, "\"");

tokenize = strtok(NULL, "\"");

sector = strdup(tokenize);

tokenize = strtok(NULL, "\"");

tokenize = strtok(NULL, "\"");

industry = strdup(tokenize);

break;

}

}

}