Function pd_string_append 

#[unsafe(no_mangle)]
pub unsafe extern "C" fn pd_string_append(
    a: *mut PdString,
    b: *const PdString,
)

String append (modifies first string)

Safety

The caller must ensure that:

• a is a valid mutable pointer to a PdString struct
• b is a valid pointer to a PdString struct
• The data fields in both structs point to valid null-terminated C strings
• The caller is responsible for the memory management of the PdString at a