How could I not including the heading of the chapter?

I wrote this function to extract the texts of one chapter out of the book - Alice in Wonderland.

When I run it, it gives me " '*CHAPTER 1*--DOWN THE RABBIT-HOLEAlice was beginning to get very tired of sitting by her sister on thebank,...."

However, I want only the texts, not including the title of the chapter. How could I fix it?

function key = getChapter(keyFile, chapter)
% key is a char row vector containing all the text in the specified chapter
% of keyFile.
% chapter: the number of the chapter to be used as the key, an integer
fid=fopen(keyFile,'r');
chap1=['*CHAPTER ',num2str(chapter),'*'];
chap2=['*CHAPTER ',num2str(chapter+1),'*'];

key='';
inchapter=0;
while ~feof(fid)
  s=fgetl(fid);
 
      if length(s)>=length(chap2) && strcmp(s(1:length(chap2)),chap2)==1 %find he "chapter 1"setence, real text should start from below
         inchapter=0;
      elseif length(s)>=length(chap1) && strcmp(s(1:length(chap1)),chap1)==1 %find the "chapter 2" sentence, real text should end b4 it
         inchapter=1;
      end
      if length(s)>length(chap1)&& inchapter==1 
         key=[key,s];
 end
  
end
fclose(fid);

[Athul Prakash]

You could trim the character vector 's' to remove the chapter headings -

s(1:length(chap1))=''  % or use 'chap2' as appropriate