find and space

I want the user to enter a word and a sentence then I want my program to find the word in that text and cout's the position the word starts. I don't want my program to find a word in middle of another for example if the user enters "hi" I don't want the program to find it in "hive" so I figured out it should also find a space after the word if finds but how should I do so the program I wrote below was only thing occurred my mind so I would be grateful if you help me edit it
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  #include <iostream>       
#include <string>         

int main ()
{ 
 
  std::string str ;
   std::getline (std::cin,str);
  std::string str2 ;
   std::getline (std::cin,str2);

 
  std::size_t found = str2.find(str" ");
  for (unsigned i=0; i<str.length(); ++i)
  { if (found!=std::string::npos)
    std::cout << str.at(i);
  }
  return 0;
}
So what I'm hearing is the user wants to find hi and the program needs to find " hi ".
Seems that would be easier than checking for a space.
so what should I do?
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#include <iostream>       
#include <string>         
#include <cctype>
using namespace std;

//===============================================

string lower( string text )
{
   for ( char &c : text ) c = tolower( c );
   return text;
}

//===============================================

bool foundIt( string text, string toFind )
{
   text   = ' ' + text   + ' ';                // add a space at beginning and end
   toFind = ' ' + toFind + ' ';

   text   = lower( text   );                   // work in a common case
   toFind = lower( toFind );

   return text.find( toFind ) != string::npos;
}

//===============================================

int main ()
{ 
   string text, toFind;

   cout << "Enter long text: ";         getline( cin, text   );
   cout << "Enter bit to be found: ";   getline( cin, toFind );
   
   cout << '"' << toFind << '"' << ( foundIt( text, toFind ) ? " was " : " was not " ) << "found in " << '"' << text << '"' << '\n';
}


Enter long text: This is the winter of our discontent
Enter bit to be found: win
"win" was not found in "This is the winter of our discontent"


Enter long text: This is the winter of our discontent
Enter bit to be found: winter
"winter" was found in "This is the winter of our discontent"
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