returns position of last byte in a string or array of bytes

get_last.c

// returns position of the last byte in an array or string whose length is known.
size_t get_last_byte(const char* const bytes, const char byte,size_t len){
    while(bytes[len]!=byte&&len)len--;
    return len;
}

// returns position of the last character of a string whose length is not known.
size_t get_last_char(const char* const str, const char byte){
    size_t pos=0;
    for(size_t i=0;str[i];i++)
        if(str[i]==byte) pos=i;
    
    return pos;
}