mark as deleted and zero content on deletion instead of shifting everything

src/common.h

@@ -2,7 +2,6 @@
 
 #include <cstdint>
 #include <iostream>
-#include <string>
 
 #define ASSERT(cond)                                                           \
   do {                                                                         \
@@ -25,11 +24,3 @@ static_assert(sizeof(float) * 8 == 32);
 using f32 = float;
 static_assert(sizeof(double) * 8 == 64);
 using f64 = double;
-
-template <typename T> constexpr char *to_char_ptr(T *ptr) noexcept {
-  return reinterpret_cast<char *>(ptr);
-}
-
-template <typename T> constexpr const char *to_char_ptr(const T *ptr) noexcept {
-  return reinterpret_cast<const char *>(ptr);
-}