Beter code

#define _XOPEN_SOURCE
#include <unistd.h>
#include<cs50.h>
#include<stdio.h>
#include<string.h>
//To include usage of functions isupper and islower
#include <ctype.h>

int main(int argc, string argv[])
{

    //Check whether there is only a single command-line argument passed when running ./crack
    if (argc != 2)
    {
        printf("The program only accepts a single command-line argument. Please re-run the program and insert a word as an argument\n");
        return 1;
    }
    string hash = argv[1];
    string encryptedHash;
    char arrChars[3] = {hash[0], hash[1], '\0'};
    string salt = arrChars;
    char password[5];
    password[4] = '\0';
    for (int i = 0; i < 51; i++)
    {
        for (int j = 0; j < 51; j++)
        {
            for (int k = 0; k < 51; k++)
            {
                for (int l = 0; l < 51; l++)
                {
                    for (int m = 0; m < 51; m++)
                    {
                        //For loop Begins
                        if (strcmp(password, "") == 0)
                        {
                            password[0] = 'a';
                            password[0] += 1;
                        }
                        else
                        {
                            if (m > 24)
                            {
                                if (m == 25)
                                {
                                    password[0] = 'A';
                                }
                                else
                                {
                                    if (password[0] == 'Z')
                                    {
                                        password[0] = 'a';
                                    }
                                    else
                                    {
                                        password[0]++;
                                    }

                                }
                            }
                            //Split Uppercase Letters(^) and Lowercase Letters(v)
                            else
                            {
                                password[0]++;
                            }
                        }
                        if (strcmp(crypt(password, salt), hash) == 0)
                        {
                            printf("Password found: %s", password);
                            return 1;
                        }
                        printf("%s\n",password);
                    }
                    //For loop Begins
                    if (strcmp(&password[1], "") == 0)
                    {
                        password[1] = 'a';
                        password[1] += 1;
                    }
                    else
                    {
                        if (l > 24)
                        {
                            if (l == 25)
                            {
                                password[1] = 'A';
                            }
                            else
                            {
                                if (password[1] == 'Z')
                                {
                                    password[1] = 'a';
                                }
                                else
                                {
                                    password[1]++;
                                }

                            }
                        }
                        //Split Uppercase Letters(^) and Lowercase Letters(v)
                        else
                        {
                            password[1]++;
                        }
                    }
                    if (strcmp(crypt(password, salt), hash) == 0)
                    {
                        printf("Password found: %s", password);
                        return 1;
                    }
                    printf("%s\n",password);
                }
                //For loop Begins
                if (strcmp(&password[2], "") == 0)
                {
                    password[2] = 'a';
                    password[2] += 1;
                }
                else
                {
                    if (k > 24)
                    {
                        if (k == 25)
                        {
                            password[2] = 'A';
                        }
                        else
                        {
                            if (password[2] == 'Z')
                            {
                                password[2] = 'a';
                            }
                            else
                            {
                                password[2]++;
                            }

                        }
                    }
                    //Split Uppercase Letters(^) and Lowercase Letters(v)
                    else
                    {
                        password[2]++;
                    }
                }
                if (strcmp(crypt(password, salt), hash) == 0)
                {
                    printf("Password found: %s", password);
                    return 1;
                }
                printf("%s\n",password);
            }
            //For loop Begins
            if (strcmp(&password[3], "") == 0)
            {
                password[3] = 'a';
                password[3] += 1;
            }
            else
            {
                if (j > 24)
                {
                    if (j == 25)
                    {
                        password[3] = 'A';
                    }
                    else
                    {
                        if (password[3] == 'Z')
                        {
                            password[3] = 'a';
                        }
                        else
                        {
                            password[3]++;
                        }

                    }
                }
                //Split Uppercase Letters(^) and Lowercase Letters(v)
                else
                {
                    password[3]++;
                }
            }
            if (strcmp(crypt(password, salt), hash) == 0)
            {
                printf("Password found: %s", password);
                return 1;
            }
            printf("%s\n",password);
        }
        //For loop Begins
        if (strcmp(&password[4], "") == 0)
        {
            password[4] = 'a';
            password[4] += 1;
        }
        else
        {
            if (i > 24)
            {
                if (i == 25)
                {
                    password[4] = 'A';
                }
                else
                {
                    if (password[4] == 'Z')
                    {
                        password[4] = 'a';
                    }
                    else
                    {
                        password[4]++;
                    }

                }
            }
            //Split Uppercase Letters(^) and Lowercase Letters(v)
            else
            {
                password[4]++;
            }
        }
        if (strcmp(crypt(password, salt), hash) == 0)
        {
            printf("Password found: %s", password);
            return 1;
        }
    }
    return 0;
}