Simple C rstrip implementation

str_rstrip.c

/**
 * @brief Strips all the characters at the end
 * @author TheRolf
 *
 * @param str target string
 * @param chars chars to find and remove
 */
void str_rstrip(char* str, const char* chars)
{
    size_t size_str = strlen(str);
    if( 0U == size_str )
        return;

    bool found_char = true;
    size_t i = size_str;
    char c_str[2];
    c_str[1] = '\0';
    do
    {
        i--;
        c_str[0] = str[i];
        found_char = NULL != strstr(chars, c_str);
        if( true == found_char )
        {
            str[i] = '\0';
        }
        else { /* go out */ }
    }
    while( (i > 0U) && (true == found_char) );
}