Function CSTL_string_erase_substr 

pub unsafe extern "C" fn CSTL_string_erase_substr(
    instance: CSTL_StringRef,
    first: *const c_char,
    last: *const c_char,
) -> *mut c_char

Removes the characters in the range [first, last) and returns a pointer following the removed character.

If first == last, no operation is performed.

The range [first, last) must be valid and dereferenceable on instance.