clarify code: local variables in start of function

src/file.c

@@ -1,3 +1,4 @@
+#include <GLFW/glfw3.h>
 #include <stdbool.h>
 #include <stdio.h>
 #include <stdlib.h>
@@ -22,6 +23,9 @@ bool file_should_update(File file) {
 }
 
 void file_update(File *file) {
+  long length;
+  FILE *file_pointer;
+
   // free remaining data
   if (file->content != 0) {
     free(file->content);
@@ -30,9 +34,9 @@ void file_update(File *file) {
   // init empty file
   file->content = 0;
   file->error = false;
-  long length;
+
   // open file
-  FILE *file_pointer = fopen(file->path, "rb");
+  file_pointer = fopen(file->path, "rb");
   if (file_pointer == NULL) {
     file->error = true;
     log_error("Cannot open file '%s'", file->path);
@@ -61,18 +65,28 @@ void file_update(File *file) {
 }
 
 File file_read(char *path) {
-  File file = {path, 0, false, 0};
+  File file;
+
+  file.path = path;
+  file.content = NULL;
+  file.error = false;
+  file.last_write = 0;
+
   file_update(&file);
   return file;
 }
 
 void file_prepend(File *src, File extra) {
-  char *old_src_content = src->content;
+  char *old_src_content;
+
+  old_src_content = src->content;
   src->content = strings_concat(extra.content, src->content);
   free(old_src_content);
 }
 
-void file_free(File *file) {
+void file_free(File *file, bool free_path) {
   free(file->content);
-  free(file->path);
+  if (free_path) {
+    free(file->path);
+  }
 }