using fork function after getting user's input

How do you get the fork function to work after getting the user's input from the fgets() function and getting tokens from the user's input?

My code:

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <unistd.h>
#include <errno.h>

/* the line can have at most 2000 words*/
void tokeniseLine(char *Line, char **Words, int *Wordn);

/* break line into words separated by whitespace, placing them in the
array words, and setting the count to Wordn */

void search&execute();

int main()
{
char Line[4000], *Words[2000], string[4000];
int Stops=0,Wordn=0;
char *end = "exit";

while(1)
{
printf("Enter program: ");
fgets(Line, 4000, stdin ); /* read a line of text here */

/* use of exitting begins when user enters 'exit' or when the program   finally locates/can't locate the user's requested file*/
if ( strcmp(Line, end) == 0 ){
exit(0);
       }
else
if ( strcmp(Line, end) != 0 ) {
printf("file successfully found.");
tokeniseLine(Line,Words,&Wordn);
search&execute();//using fork function to make process
 }
return 0;
 }

 void tokeniseLine(char *Line, char **Words, int *Wordn)
 {
 char *token;

  /* get the first token */
  token = strtok(Line, " \t\n");

  /* walk through other tokens */
  while( token != NULL ) 
  {    
   token = strtok(NULL, " \t\n");
   }
    return;
   }

    void search&execute()//this is the function which I wanted to work last   after the user input is tokenised
   {
    pid_t childpid; /* variable to store the child's pid */
    int retval;     /* child process: user-provided return code */
    int status;     /* parent process: child's exit status */

     /* only 1 int variable is needed because each process would have its
      own instance of the variable
      here, 2 int variables are used for clarity */

     /* now create new process */
      childpid = fork();

      if (childpid >= 0) /* fork succeeded */
     {
      if (childpid == 0) /* fork() returns 0 to the child process */
      {
        printf("CHILD: I am the child process!\n");
        printf("CHILD: Here's my PID: %d\n", getpid());
        printf("CHILD: My parent's PID is: %d\n", getppid());
        printf("CHILD: The value of my copy of childpid is: %d\n",childpid);
        printf("CHILD: Sleeping for 1 second...\n");
        sleep(1); /* sleep for 1 second */
        printf("CHILD: Enter an exit value (0 to 255): ");
        scanf(" %d", &retval);
        printf("CHILD: Goodbye!\n");    
        exit(retval); /* child exits with user-provided return code */
        }
        else /* fork() returns new pid to the parent process */
        {
        printf("PARENT: I am the parent process!\n");
        printf("PARENT: Here's my PID: %d\n", getpid());
        printf("PARENT: The value of my copy of childpid is %d\n",childpid);
        printf("PARENT: I will now wait for my child to exit.\n");
        wait(&status); /* wait for child to exit, and store its status */
        printf("PARENT: Child's exit code is: %d\n", WEXITSTATUS(status));
        printf("PARENT: Goodbye!\n");             
        exit(0);  /* parent exits */       
    }
}
else /* fork returns -1 on failure */
{
    perror("fork"); /* display error message */
    exit(0); 
}

}

I tried to have the fork function to return the fork value, but it doesn't work when I tried to add in user input. How do you fix that?