CE fix strange characters appearing at the end of file

ce/context.c

@@ -4,6 +4,7 @@
 #include <printf.h>
 #include <stdarg.h>
 #include <stddef.h>
+#include <string.h>
 
 void cprintf (struct context* context, const char* fmt, ...) {
   va_list args;
@@ -16,6 +17,7 @@ void cprintf (struct context* context, const char* fmt, ...) {
     return;
   }
 
+  memset (buf, 0, CPRINTF_BUF_MAX);
   int len = vsnprintf (buf, CPRINTF_BUF_MAX, fmt, args);
 
   va_end (args);

ce/edit.c

@@ -138,7 +138,7 @@ void edit_start (const char* file_path, const char* text) {
         bb_remaining -= w;
       }
 
-      w = snprintf (bbptr, bb_remaining, ANSIQ_SCR_CLR2LEND "\n");
+      w = snprintf (bbptr, bb_remaining, ANSIQ_SCR_CLR2END "\n");
       bbptr += w;
       bb_remaining -= w;
 

ce/interp.c

@@ -2,6 +2,7 @@
 #include "arena_alloc.h"
 #include "context.h"
 #include "edit.h"
+#include "mprintf.h"
 #include "parser.h"
 #include "self.h"
 #include <desc.h>

ce/mprintf.c

@@ -3,6 +3,7 @@
 #include <liballoc.h>
 #include <printf.h>
 #include <stdarg.h>
+#include <string.h>
 #include <system.h>
 
 void putchar_ (char ch) { (void)ch; }
@@ -18,6 +19,7 @@ void mprintf (const char* fmt, ...) {
     return;
   }
 
+  memset (buf, 0, MPRINTF_BUF_MAX);
   int len = vsnprintf (buf, MPRINTF_BUF_MAX, fmt, args);
 
   va_end (args);