pub unsafe extern "C" fn duk_substring(
ctx: *mut duk_context,
idx: duk_idx_t,
start_char_offset: duk_size_t,
end_char_offset: duk_size_t,
)pub unsafe extern "C" fn duk_substring(
ctx: *mut duk_context,
idx: duk_idx_t,
start_char_offset: duk_size_t,
end_char_offset: duk_size_t,
)