Use C programing language to write a function htoi(s), which converts a string of hexadecimal digits to int.?

Use C programing language to write a function htoi(s), which converts a string of hexadecimal digits (including an optimal 0x or 0X) into its equivalent integer value. The allowable digits are 0 through 9, a through f and A through F.





Could you please write down the full CODE for this matter! thanks much

Use C programing language to write a function htoi(s), which converts a string of hexadecimal digits to int.?
int ftoi(char[] s)


{


int len = sizeof(s)/sizeof(char);


int value = 0;


int base =1;


int charInt;





for(int i=len-1;i%26gt;=0;i--)


if( s[i]%26gt;='0' %26amp;%26amp; s[i]%26lt;='9')


charInt = s[i]-'0';


else if(s[i]%26gt;='a' %26amp;%26amp; s[i]%26lt;='f')


charInt = s[i]-'a' +10;


else if(s[i]%26gt;='A' %26amp;%26amp; s[i]%26lt;='F')


charInt = s[i]-'A' +10;


else


return -1;





value += base*charInt;


base *= 16;


}


return value;


}