game folder "just" compiles (not link)

game/encrypt.c

@@ -0,0 +1,66 @@
+#include <stdio.h>
+#include <malloc.h>
+#include <mem.h>
+#include <stdlib.h>
+#include <string.h>
+
+FILE *source,*target;
+
+void encrypt_file(FILE *sr,FILE *tg)
+  {
+  int i,j,last=0;
+
+  i=getc(sr);
+  while (i!=EOF)
+    {
+    j=i-last;
+    last=i;
+    putc(j,tg);
+    i=getc(sr);
+    }
+  }
+
+void open_files(char *src,char *tgr)
+  {
+  if (tgr==NULL)
+    {
+    char *c,*d;
+    tgr=alloca(strlen(src)+5);
+    strcpy(tgr,src);
+    c=strrchr(tgr,'\\');
+    d=strrchr(tgr,'.');
+    if (c>d) d=strchr(tgr,0);
+    strcpy(d,".ENC");
+    }
+  source=fopen(src,"rb");
+  target=fopen(tgr,"wb");
+  }
+
+void close_files()
+  {
+  fclose(source);
+  fclose(target);
+  }
+
+
+char main(int argc,char **argv)
+  {
+  if (argc<2)
+    {
+    puts("Pouziti: ENCRYPT zdroj.ext [cil.ext] \n"
+         "\n"
+         "Pokud nezadas cil, doplni se zdroj s koncovkou .enc\n"
+         "Nikdy nezadavej pouze cestu jako cil. Vzdycky uved jmeno!");
+    return 0;
+    }
+  if (argc==2) open_files(argv[1],NULL);
+  else open_files(argv[1],argv[2]);
+  if (source==NULL)
+    {puts("Nemuzu najit zdrojovy soubor\n");return 1;};
+  if (target==NULL)
+    {puts("Nemuzu otevrit cil pro zapis\n");return 1;};
+  encrypt_file(source,target);
+  close_files();
+  puts("Ok.");
+  return 0;
+  }