strtol working on

#include <assert.h>
#include <ctype.h>
#include <errno.h>
#include <limits.h> // includs LONG_MIN LONG_MAX

long strtol(char* nPtr, char **endPtr , int base)
{

    char *string;
    long returnedNumber = 0;

    int outsideTheLimit;
    int numberSign;
    int addedDigit;


    assert(nPtr); // quits if string is empty
    string = nPtr; // string points to the same place as nPtr

    while(isspace(* string)) // omitt white numbers
    {
        string++;endPtr
    }

    if(*string =='-')
    {
        numberSign = 1;
        string++;
    }
    else
    {
        if(*string =='+')
        {
            numberSign = 0;
            string++;
        }
        else numberSign = 0;
    }


    if((base == 8) && (*string =='0'))
    {
        string++;
    }

    if((base == 16) && (*string =='0'))
    {
        string++;

        if((*string =='x')||(*string =='X'))
        {
            string++;
        }
        else
        {
            string--;
        }
    }
    if((*string =='0') && (base == 0))
    {
        base = 8;
        string++;

        if((*string =='x')||(*string =='X'))
        {
            base = 16;
            string++;
        }

    }
    else if(base == 0) //if the base is 0 and not 0x or 0X then the base is 10
    {
        base = 10;
    }
    if(base < 2 || base > 36)
    {
        errno = EINVAL; // if base outside [2;36]
        return 0;
    }
    if((base == 8)&&((*string < '0')||(*string > '7')))

    {
        *endPtr = string;
        return 0;
    }

    if((base == 16) && ((*string < '0')||((*string >'9')&&(*string < 'A'))||((*string > 'F')&&(*string < 'a'))||(*string > 'f')))
    {
        string--;
        *endPtr = string;
        return 0;
    }



    while(*string!='\0') // pointing to end of file
    {
        if(isdigit(*string)) // to return digit or nothing
        {
                addedDigit = *string - '0'; //ascci conversion
        }
        else
        {
            if(isalpha(*string)) //  0 or a letter
            {
                if(islower(*string)) //points to the lower case letter
                {
                    addedDigit = (*string - 'a') + 10; //converts letters ASCII to digits
                }
                else
                {
                    addedDigit = (*string - 'A') + 10;
                }
            }
            else
            {
                break;
            }
        }
    }

        switch(numberSign);
        {
            case 0:
            {
                if(outsideTheLimit < 0  || returnedNumber < ((LONG_MAX - addedDigit)/ base)) // check if the number is outsie the limits
                {
                    outsideTheLimit = - 1;
                    string ++;
                }
                else
                {
                    outsideTheLimit = 1;
                    returnedNumber = (returnedNumber * base ) + addedDigit ;
                    string++ ;
                }
                break ;
            }

            case 1:
            {
                if(outsideTheLimit > 0  || returnedNumber > ((LONG_MAX - addedDigit)/ base))
                {
                    outsideTheLimit = - 1;
                    string ++;
                }
                else
                {
                    outsideTheLimit = 1;
                    returnedNumber = (returnedNumber * base ) - addedDigit ;
                    string++ ;
                }
                  break;
            }


        }


    }

    if(outsideTheLimit < 0) // to return max or min it depends on te sin
    {
         returnedNumber = numberSign ? LONG_MIN : LONG_MAX  //something like that ? checik it XD

            errno = ERANGE; // out of the range xD

    }

    if(endPtr







    return returnedNumber;
}