added useful comments

file_own.c

 #include "file_own.h"
 
 //V: playerhighscore exists and score.txt exists
-//N if playerhighscore < current score; score gets written into score txt. Else score is rewritten into file
+//N if playerhighscore > current score; playerhighscore is written into corresponding space in score.txt. The rest is rewritten into score.txt (including the theme if playerhighscore < score)
 int write_table (enum vehicle theme) {
     FILE *my_file = fopen("images/score.txt", "r+");
     if (my_file == NULL ) {
         printf("File could be opened. file_own\n");
         return -1;
     } 
-    //Für jede Map ein Score
+    //Für jede Map ein Score, initiiert mit Null
     int score_normal = 0;
     int score_street = 0;
     int score_trains = 0;
     int score_water = 0;
 
-    //variable theme
-
+    //liest die scores aus dem file aus
     if (fscanf(my_file,"%d,%d,%d,%d", &score_normal, &score_street, &score_trains, &score_water) == EOF) {
         printf("File could not be scanned. Error: %d file_own\n", errno); // wie ferror() ?
     };
@@ -25,6 +24,7 @@ int write_table (enum vehicle theme) {
     //truncate overwrites too much, but doesnt really matter afaik
     if (ftruncate(fileno(my_file), 64) == -1) printf("File couldnt be truncated\n");
 
+    // Je nach Fall aktualisieren wir den score, wenn dieser kleiner ist als der playerhighscore
     switch(theme) {
         case coin:
             if (playerhighscore > score_normal) {
@@ -66,6 +66,9 @@ int write_table (enum vehicle theme) {
     return 0;
 }
 
+//V: enum vehicle exists and has 4 parameters (with the right names) for the classes
+//N: my_file is the same as before or if it was empty 0,0,0,0
+//E: returns the current highscore of the theme given to the function
 int read_table (enum vehicle theme) {
     FILE *my_file = fopen("images/score.txt", "r");
         if (my_file == NULL ) {
@@ -82,11 +85,13 @@ int read_table (enum vehicle theme) {
         //Wir schließen es im read modus und öffnen es im write modus
         if (fclose(my_file) == EOF) printf("failed to close file. file_own 2\n");
         my_file = fopen("score.txt", "w+");
+        //Wir wissen, da fscanf  gefailed aber fopen funktioniert hat, dass das file leer ist und schreibne deshalb 0,0,0,0 rein
         fprintf(my_file, "0,0,0,0");
         if (fscanf(my_file,"%d,%d,%d,%d", &score_normal, &score_street, &score_trains, &score_water) == EOF) printf("Score immer noch nicht drinnen");
     };
 
     if (fclose(my_file) == EOF) printf("failed to close file. file_own 2\n");
+
     switch (theme) {
         case coin: return score_normal;
         case car: return score_street;
@@ -99,6 +104,7 @@ int read_table (enum vehicle theme) {
 
 //V: score.txt exists
 //N: simply makes score.txt empty
+//CURRENTLY NOT USED
 int reset_table (void) {
     FILE *my_file = fopen("images/score.txt", "w");
     if (fclose(my_file) == EOF) {