wdg-base32 0.5.2

The Base32 Data Encoding
Documentation 
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impl B32Encode<String,String> for B32<String>{
    fn encode(data:String)->String{
        let len_input:usize=data.len();
        let size:usize=len_input/5*8+if len_input%5==0 {0}else{8};
        let mut string:String=String::with_capacity(size);
        unsafe{
            let vector=&mut string.as_mut_vec();
            vector.set_len(size);
            b32_encode_1(data.as_ptr(),len_input,ALPHABET32_ENCODE.as_ptr(),vector.as_mut_ptr());
        }
        return string;
    }
}

impl B32Decode<String,String> for B32<String>{
    fn validation(data:String)->B32DecodeError{
        return b32_validation(data.as_ptr(),data.len(),1,ALPHABET32_DECODE.as_ptr(),6,0b1011011,8,0,0);
    }
    fn decode(data:String)->Result<String,B32DecodeError>{
        let ptr_data=data.as_ptr();
        let len_data=data.len();
        let ptr_alphabet=ALPHABET32_DECODE.as_ptr();

        let error=b32_validation(ptr_data,len_data,1,ptr_alphabet,6,0b1011011,8,0,0);
        if error!=B32DecodeError::Null {return Err(error)};

        let np=if len_data>6 {unsafe{if *ptr_data.offset((len_data-6) as isize)==61 {6}else{if *ptr_data.offset((len_data-4) as isize)==61 {4}else{if *ptr_data.offset((len_data-3) as isize)==61 {3}else{if *ptr_data.offset((len_data-1) as isize)==61 {1}else{0}}}}}}else{0};
        let size=(len_data-np)*5/8;
        let mut string=String::with_capacity(size);
        unsafe{
            let mut vector=&mut string.as_mut_vec();
            vector.set_len(size);
            b32_decode_1(ptr_data,len_data,ptr_alphabet,vector.as_mut_ptr(),np);
        }
        return Ok(string);
    }
    unsafe fn unsafe_decode(data:String)->String{
        let ptr_data=data.as_ptr();
        let len_data=data.len();
        let ptr_alphabet=ALPHABET32_DECODE.as_ptr();

        let np=if len_data>6 {if *ptr_data.offset((len_data-6) as isize)==61 {6}else{if *ptr_data.offset((len_data-4) as isize)==61 {4}else{if *ptr_data.offset((len_data-3) as isize)==61 {3}else{if *ptr_data.offset((len_data-1) as isize)==61 {1}else{0}}}}}else{0};
        let size=(len_data-np)*5/8;
        let mut string=String::with_capacity(size);
        {
            let mut vector=&mut string.as_mut_vec();
            vector.set_len(size);
            b32_decode_1(ptr_data,len_data,ptr_alphabet,vector.as_mut_ptr(),np);
        }
        return string;
    }
}