removed unused and unimplemented malloc definitions

kinclude/malloc.c

@@ -11,17 +11,8 @@ void malloc_init(malloc_info* given_info)
     allocate_memory_end = given_info->allocate_memory_end;
 }
 
-optional_voidptr malloc(size_t size)
-{
-    return (optional_voidptr) { .error = ENOMEM };
-}
-
-int free(void* ptr)
-{
-    return EINVAL;
-}
-
 // allocate stack and return a pointer to the *end* of the allocated region
+// this doesn't reuse stack from functions which exited
 optional_voidptr malloc_stack(size_t size)
 {
     void* new_alloc_end = (void*) (((int) allocate_memory_end) - size);

kinclude/malloc.h

@@ -8,9 +8,6 @@ typedef struct malloc_info {
     void* allocate_memory_start;
 } malloc_info;
 
-optional_voidptr malloc(size_t size);
-// int free(void* ptr);
-
 optional_voidptr malloc_stack(size_t size);
 
 void malloc_init(malloc_info* info);