lua_pushstring[-0, +1, m]
const char *lua_pushstring (lua_State *L, const char *s);
Pushes the zero-terminated string pointed to by s onto the stack. Lua makes (or reuses) an internal copy of the given string, so the memory at s can be freed or reused immediately after the function returns.
Returns a pointer to the internal copy of the string.
If s is NULL, pushes nil and returns NULL.
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