fixed some errors

include/file.h

@@ -13,28 +13,28 @@ typedef struct {
 
 file_t *file_new(char *path);	     			// initialization function
 
-void file_cleanup(file_t *this);					// just to be memory safe...
+void file_cleanup(file_t *self);					// just to be memory safe...
 
-void file_print(file_t *this);						// prints the file as a string
+void file_print(file_t *self);						// prints the file as a string
 
-char *file_to_string(file_t *this);					// returns a string with the file contents
+char *file_to_string(file_t *self);					// returns a string with the file contents
 
-void file_writeln(file_t *this, char *payload);		// appends a given string to the file on a newline
+void file_writeln(file_t *self, char *payload);		// appends a given string to the file on a newline
 
-void file_write(file_t *this, char *payload);		// appends a given string to the file (not on a newline!)
+void file_write(file_t *self, char *payload);		// appends a given string to the file (not on a newline!)
 
 void file_copy(file_t* src, char *dst);			// copy file src into file dst
 
-void file_delete(file_t *this);						// deletes a file
+void file_delete(file_t *self);						// deletes a file
 
 void file_move(file_t* src, char *dst);			// moves/renames a file
 
-bool file_exists(file_t *this);						// 1 = yes, 0 = no
+bool_t file_exists(file_t *self);						// TRUE = yes, FALSE = no
 
 void file_create(char *path);				// create an empty file with the given name
 
-void file_number_lines(file_t *this);				// prepend line numbers in front of each line in a file
+void file_number_lines(file_t *self);				// prepend line numbers in front of each line in a file
 
-int file_count_words(file_t *this);					// counts the number of words in a file
+int file_count_words(file_t *self);					// counts the number of words in a file
 
 #endif // FILE_H