First commit, everything finished and ready.

Makefile

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+# GNU/Linux specific Make directives.
+
+# Declare tools.
+SHELL = /bin/sh
+CC = clang
+LD = clang
+ECHO = @echo
+
+CFLAGS	= -std=c17 -Wall -Wextra -O0 -Wno-unused-variable -Wno-unused-parameter -I./include
+LDFLAGS	=
+
+EXECUTABLE = inverT
+
+SOURCES = main.c functions.c
+OBJECTS = $(SOURCES:.c=.o)
+CLEANFILES = main.o functions.o
+
+
+
+# To get a fully verbose make output do declare 'AT' at the command line like so: 'make AT='.
+# By default AT is undefined and thus assigned the string '@' which suppresses output from commands.
+AT ?= @
+
+# Colors and efects
+#######################################
+
+NORMAL			= \033[m
+
+FG_BLACK		= \033[30m
+FG_DKRED		= \033[31m
+FG_DKGREEN		= \033[32;7m
+FG_DKYELLOW		= \033[33m
+FG_DKBLUE		= \033[34m
+FG_DKMAGENTA		= \033[35m
+FG_DKCYAN		= \033[36m
+FG_GRAY			= \033[37m
+FG_DKGRAY		= \033[30;1m
+FG_REDFULL		= \033[31;7m
+FG_GREEN		= \033[32;1m
+FG_YELLOW		= \033[33;7m
+FG_BLUE			= \033[34;7m
+FG_MAGENTA		= \033[35;1m
+FG_CYAN			= \033[36;1m
+FG_WHITE		= \033[37;1m
+
+
+BG_BLACK		= \033[40m
+BG_DKRED		= \033[41m
+BG_DKGREEN		= \033[42m
+BG_DKYELLOW		= \033[43m
+BG_DKBLUE		= \033[44m
+BG_DKMAGENTA		= \033[45m
+BG_DKCYAN		= \033[46m
+BG_GRAY			= \033[47m
+BG_DKGRAY		= \033[40;1m
+BG_RED			= \033[41;1m
+BG_GREEN		= \033[42;1m
+BG_YELLOW		= \033[43;1m
+BG_BLUE			= \033[44;1m
+BG_MAGENTA		= \033[45;1m
+BG_CYAN			= \033[46;1m
+BG_WHITE		= \033[47;1m
+
+##########################################
+
+.SUFFIXES: .c .o
+.PHONY: clean
+
+# Compile
+all: clean $(EXECUTABLE)
+
+.c.o:
+	$(ECHO) "[$(FG_BLUE)COMPILING$(NORMAL)] $@"
+	$(AT) $(CC) $(CFLAGS) -o $*.o -c $<
+
+$(EXECUTABLE): $(OBJECTS)
+	$(ECHO) "[$(FG_YELLOW)LINKING$(NORMAL)] $(EXECUTABLE)"
+	$(AT) $(LD) $(LDFLAGS) $(OBJECTS) -o $(EXECUTABLE)
+	$(ECHO) "[$(FG_DKGREEN)SUCCESS$(NORMAL)] Run ./$(EXECUTABLE) to start your application, Enjoy :)"
+
+clean:
+	$(ECHO) "[$(FG_REDFULL)CLEANED$(NORMAL)] $(CLEANFILES)"
+	$(AT) rm -rf $(CLEANFILES)

functions.c

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+#include <main.h>
+
+int ask_file() {
+
+	printf ("Insert name of the file to be read : ");
+	fgets(info.filename, info.fileNameSize, stdin);
+	info.filename[strlen(info.filename)-1] = '\0';
+	invert_file();
+	return 0;
+}
+
+int get_file(char *fileName) {
+
+	strcpy(info.filename, fileName);
+	invert_file();
+	return 0;
+}
+
+int invert_file(void) {
+
+	if ((info.fd= fopen(info.filename, "r")) != NULL){
+	int ft, i = 0;
+
+    fseek(info.fd, 0, SEEK_END);
+
+    ft = ftell(info.fd);
+    while(i < ft)
+    {
+        i++;
+        fseek(info.fd, -i, SEEK_END);
+        printf("%c", fgetc(info.fd));
+    }
+	printf("\n");
+
+		fclose(info.fd);
+	}
+
+	else {
+		perror(info.filename);
+	}
+
+	return 0;
+}

include/main.h

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+#ifndef  __CHCOUNT_H__
+#define  __CHCOUNT_H__
+
+#include <stdio.h>
+#include <errno.h>
+#include <ctype.h>
+#include <string.h>
+
+
+//Function declarations
+int ask_file();					// It has no flags, it just prompts for filename
+int get_file(char *fileName);	// Gets the filename passed on has an argument
+int invert_file(void);			// Invert the file stored in the variable info.filename
+
+
+//This are general parameters for the program
+struct parameters {
+
+	char filename[100];		// Filename where the text is
+	FILE *fd;				// File descriptor for the text file
+	char version[5];		// Holds the software version
+	int fileNameSize;		// File maximum name size
+	char help[];			// Help menu to be printed on screen
+};
+
+struct parameters info;
+
+#endif

main.c

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+/**
+	This program inverts the caracters in a
+	given text file, using command line arguments
+	or by prompting the question to the user.
+
+	By Joni Silva, 27/05/2022.
+
+*/
+
+#include <main.h>
+
+
+// Necessary to initalize my struct with all the info
+struct parameters info = {
+	.filename = "EMPTY",
+	.fd = NULL,
+	.version = "1.0",
+	.fileNameSize = 80,
+// Below is the variable that olds the text to dislpay for help
+	.help = "\n\
+------------------------------------------------\n\
+Usage: ./chcount -c [<some.text.file>]\n\
+  -help      Print help and exit.\n\
+  -v         Print application version and exit.\n\
+  -i	     Invert text caracters.\n\
+Example: ./chcount -c test.txt\n",
+};
+
+
+int main (int argc, char *argv[])  {
+
+
+	if (argc == 1) {
+		ask_file();
+	}
+
+	else if (argc == 2) {
+		if (strncmp(argv[1], "-help", 5) == 0) {
+			printf("%s\n", info.help);
+		}
+		else if (strncmp(argv[1], "-v", 2) == 0) {
+			printf("Version %s\n", info.version);
+		}
+		else {
+			get_file(argv[1]);
+		}
+	}
+
+	else if (argc == 3) {
+		if(strncmp(argv[1], "-i", 2) == 0) {
+			get_file(argv[2]);
+		}
+		else {
+			printf("\nInvalid flag!!!");
+			printf("%s\n", info.help);
+		}
+	}
+
+	else {
+		printf("\nTo many parameters!!!");
+		printf("%s\n", info.help);
+	}
+
+	return 0;
+}

text

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+Murder for a jar of red rum