(CS50) Crack

#include <cs50.h>
#include <stdio.h>
#include <crypt.h>
#include <string.h>

/*
brian:51.xJagtPnb6s
bjbrown:50GApilQSG3E2
emc:502sDZxA/ybHs
greg:50C6B0oz0HWzo
jana:50WUNAFdX/yjA
lloyd:50n0AAUD.pL8g
malan:50CcfIk1QrPr6
natmelo:50JIIyhDORqMU
rob:51v3Nh6ZWGHOQ
veronica:61v1CDwwP95bY
walker:508ny6Rw0aRio
zamyla:50cI2vYkF0YU2
*/

bool checkpass(string inputhashes, string generatedpass, string isalt);

int main(int argc, string argv[])
{
    if (argc != 2)                            //checking if the amount of arguments is correct
    {
        printf("Usage: ./crack hash\n");
        return 1;
    }

    string hashedpass = argv[1];              //getting the hashed pass from the argument
    int saltdigits = 2;                       //
    char salt[saltdigits + 1];                //adding 1 space for the end of the array
    for (int i = 0; i < saltdigits; i++)      //taking the salt from the hashedpass
    {
        salt[i] = hashedpass[i];
    }

    string alphabeth = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ";
    int alphalen = strlen(alphabeth);
    //printf("%s\n", crypt("g","20"));

    //checking pass of 1 letter
    for (int i = 0; i < alphalen; i++)
    {
        char key[2];
        key[0] = alphabeth[i];
        if (checkpass(hashedpass, key, salt) == true)
        {
            printf("The password is: %s\n", key);
            return 0;
        }
    }

    //checking pass of 2 letters
    for (int i = 0; i < alphalen; i++)            // first letter
    {
        for (int i1 = 0; i1 < alphalen; i1++)     // second letter
        {
            char key[3];
            key[0] = alphabeth[i];
            key[1] = alphabeth[i1];    // both letters together
            if (checkpass(hashedpass, key, salt) == true)
            {
                printf("The password is: %s\n", key);
                return 0;
            }
        }
    }

    //checking pass of 3 letters
    for (int i = 0; i < alphalen; i++)
    {
        for (int i1 = 0; i1 < alphalen; i1++)
        {
            for (int i2 = 0; i2 < alphalen; i2++)
            {
                char key[4];
                key[0] = alphabeth[i];
                key[1] = alphabeth[i1];
                key[2] = alphabeth[i2];
                if (checkpass(hashedpass, key, salt) == true)
                {
                    printf("The password is: %s\n", key);
                    return 0;
                }
            }
        }
    }

    //checking pass of 4 letters
    for (int i = 0; i < alphalen; i++)
    {
        for (int i1 = 0; i1 < alphalen; i1++)
        {
            for (int i2 = 0; i2 < alphalen; i2++)
            {
                for (int i3 = 0; i3 < alphalen; i3++)
                {
                    char key[5];
                    key[0] = alphabeth[i];
                    key[1] = alphabeth[i1];
                    key[2] = alphabeth[i2];
                    key[3] = alphabeth[i3];
                    if (checkpass(hashedpass, key, salt) == true)
                    {
                        printf("The password is: %s\n", key);
                        return 0;
                    }
                }
            }
        }
    }

    //checking pass of 5 letters
    for (int i = 0; i < alphalen; i++)
    {
        for (int i1 = 0; i1 < alphalen; i1++)
        {
            for (int i2 = 0; i2 < alphalen; i2++)
            {
                for (int i3 = 0; i3 < alphalen; i3++)
                {
                    for (int i4 = 0; i4 < alphalen; i4++)
                    {
                        char key[6];
                        key[0] = alphabeth[i];
                        key[1] = alphabeth[i1];
                        key[2] = alphabeth[i2];
                        key[3] = alphabeth[i3];
                        key[4] = alphabeth[i4];

                        if (checkpass(hashedpass, key, salt) == true)
                        {
                            printf("%s\n", key);
                            return 0;
                        }
                    }
                }
            }
        }
    }

    printf("The password wasn't found.\n");
    return 1;
}

bool checkpass(string inputhashes, string generatedpass, string isalt)  //check if the hashes are equal
{
    bool result = false;
    string join = crypt(generatedpass, isalt);
    if (strcmp(join, inputhashes) == 0)
    {
        result = true;
    }
    return result;
}
// I need to find a way of not repeat all loops