How to you find a string in a file in C?

I have this code in C: How do I code a part to find the string "Sending boot event"  that is contained in the BlackHostLog.txt  and report a message saying passed to the status file?
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
//monitor the status of the Black Host Window by its log file and
//update a status text file with a flag value (text) when the status changes.
int main(int argc, char *argv[])
{
  char text [100];
  //Declare a File Pointer
  FILE *file_ptr;
  //Open the log file
  file_ptr=fopen("BlackHostLog.txt", "r");
  //Test
  if(file_ptr != NULL)
  {
              printf("BlackHostLog.txt opened.\nContents:\n");
              //Read the text
              while(fgets(text, 100, file_ptr)!=NULL)
              {
                                printf("%s", text);
              }
                       //Create the Status File
              file_ptr=fopen("status.txt","w");
                       //test
              if(file_ptr != NULL)
              {
                          printf("Status File was created\n");
                          //close the file
                          fclose(file_ptr);
              }
              else{printf("Unable to create the status file.\n"); return 1; }
           
              //Close the file
              fclose(file_ptr);
              system("PAUSE");
              return 0;
           
  }
  else
  {
              printf("Unable to open the log file.\n");
              return 1;
             
  }
}

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