Linux "wc" command implementation in C language.(Noobish)

Linux "wc" command implementation in C language.

/* compile using "gcc -o wc <file.c>" and work just like wc only tested on asci text file*/

#include<stdlib.h>
#include<stdio.h>
#include<string.h>
#include<unistd.h>

FILE * getFileBuffer(char * file_name);
int lineCount(char * filepath);
int wordCount(char * filepath);
int charCount(char * filepath);
void help();


int main(int argc, char *argv[])
{
  if (argc == 1)
  {
    printf("No arguments provided\n");
    help();
    return 0;
  } 
  printf("  ");
  char *filepath = argv[(argc -1)];
  int option;
  while ((option = getopt(argc, argv, "wcl")) != -1) {
    switch (option) {
    case 'w':
      printf("%d ", wordCount(filepath));
      break;
    case 'c':
      printf("%d ", charCount(filepath));
      break;
    case 'l':
      printf("%d ", lineCount(filepath));
      break;
    default:
    printf("Invalid option\n");
    help();
    return 0;
  
    }
  
  }
  printf("%s\n", filepath);
  return 0;
}


/*functions*/

 FILE * getFileBuffer(char * file_name){
    FILE * file_buffer = fopen(file_name, "r");
    if(file_buffer == NULL){
        printf("File not found\n");
        return NULL;
    }
    return file_buffer;
}
int lineCount(char * filepath){
    FILE * file_buffer = getFileBuffer(filepath);
    int count = 0;
    char line[100];
    while(fgets(line , sizeof(line), file_buffer))
    {
        count++;
    }
    return count;
}
int wordCount(char * filepath){
    FILE * file_buffer = getFileBuffer(filepath);
    int count = 0;
    char line[100];
    while(fgets(line , sizeof(line), file_buffer))
    {
        //count the number of words in the line
        char * p = strtok(line, " ");
        while(p != NULL)
        {
            count++;
            p = strtok(NULL, " ");
        }
     }
    return count;
}

int charCount(char * filepath){
    FILE * file_buffer = getFileBuffer(filepath);
    int count = 0;
    char line[100];
    while(fgets(line , sizeof(line), file_buffer))
    {
        count += strlen(line);
    }
    return count;
}

void help(){  
    FILE *file = fopen("../src/help.txt", "r");
    char line[100];
    while(fgets(line , sizeof(line), file))
    {
        printf("%s", line);
    }
}