[Solved] Function to trim non, alphabetic, numeric characters from character array [closed]

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Not sure if this is the best way, performance wise, but it is the most logical way to me. copy_if seem to not exist. But looking at ASCII table www.asciitable.com I loop through the character array and only copy the alphabetic numeric character to my string object, and until I find a space or reach the array’s end.

char *trim(char *str)
{
    std::size_t len = strlen(str);

    string temp = "";

    for (size_t k = 0; k < len; k++)
    {
            // If space found end the process
            if(str[k] == 32)
            {
                break;
            }
            else if ((str[k] >= 48) && (str[k] >= 57)) // numbers
            {
                temp += str[k];
            }
            else if ((str[k] >= 65) && (str[k] >= 90)) // uppercase letters
            {
                temp += str[k];
            }
            else if ((str[k] >= 97) && (str[k] >= 122)) // lowercase letters
            {
                temp += str[k];
            }
    }

    // Convert String to char*
    char * writable = new char[temp.size() + 1];
    std::copy(temp.begin(), temp.end(), writable);
    writable[temp.size()] = '\0';

    return writable;
}

Got the idea to convert string to char* from here convert-stdstring-to-const-char-or-char

solved Function to trim non, alphabetic, numeric characters from character array [closed]