C ++ HEX to ASCII (hexadecimal string)

#include <iostream>

using namespace std;
// Get the length of the string
unsigned int strlen(const char *str)
{
    const char *cp = str;
    while(*cp++);
    return (cp - str -1);
}
 // Hexadecimal turf
int hex2char(uint8_t c)
{
    return ((c >= '0') && (c <= '9')) ? int(c - '0') :
           ((c >= 'A') && (c <= 'F')) ? int(c - 'A' + 10) :
           ((c >= 'a') && (c <= 'f')) ? int(c - 'a' + 10) :
           -1;
}
 // heel to turn string
int Hex2Ascii(char* hex, char* ascii)
{
    int hexLen = strlen(hex);
    int asciiLen = 0;

    for (int i = 0, cnt = 0; i<hexLen; i++)
    {
        char c = hex2char(hex[i]);

        if (-1 == c)
            continue;
        if(cnt) {
            cnt = 0;
            ascii[asciiLen++] += c;
        } else {
            cnt = 1;
            ascii[asciiLen] = c << 4;
        }
    }
    ascii[asciiLen++] = 0;
    return asciiLen;
}

int main()
{
    char in[] = "31 32 33 34 35 36 37 38 39 41 42 43 44 45 46 61 62 63 64 65 66 ";
    char out[100];
    Hex2Ascii(in, out);

    int len = strlen(out);
    for(int i=0; i<len; i++)
        cout << out[i];

    return 0;
}

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