C Program to Display every possible Combination of two Words or Strings from the input Strings without Repeated Combinations

#include < stdio.h>
#include < string.h>
 
void main()
{
    int i, j = 0, k, k1 = 0, k2 = 0, row = 0;
    char temp[50];
    char str[100], str2[100], str1[5][20], str3[6][20], str4[60][40];
 
    printf("enter the string :" );
    scanf(" %[^\n]s" , &str);
    printf("enter string:" );
    scanf(" %[^\n]s" , &str2);
 
/* read strings into 2d character arrays */
    for (i = 0;str[i] != '\0'; i++)
    {
        if (str[i] == ' ')
        {
            str1[k1][j] = '\0';
            k1++;
            j = 0;
        }
        else
        {
            str1[k1][j] = str[i];
            j++;
        }
    }
    str1[k1][j] = '\0';
    j = 0;
    for (i = 0;str2[i] != '\0';i++)
    {
        if (str2[i] == ' ')
        {
            str3[k2][j] = '\0';
            k2++;
            j = 0;
        }
        else
        {
            str3[k2][j] = str2[i];
            j++;
        }
    }
    str3[k2][j] = '\0';
 
/* concatenates string1 words with string2 and stores in 2d array */    
    row = 0;
    for (i = 0;i <= k1;i++)
    {
        for (j = 0;j <= k2;j++)
        {
            strcpy(temp, str1[i]);
            strcat(temp, str3[j]);
            strcpy(str4[row], temp);
            row++;
        }
    }
    for (i = 0;i <= k2;i++)
    {
        for (j = 0;j <= k1;j++)
        {
            strcpy(temp, str3[i]);
            strcat(temp, str1[j]);
            strcpy(str4[row], temp);
            row++;
        }
    }
 
/* eliminates repeated combinations */
    for (i = 0;i < row;i++)
    {
        for (j = i + 1;j < row;j++)
        {
            if (strcmp(str4[i], str4[j]) == 0)
            {
                for (k = j;k <= row;k++)
                {
                    strcpy(str4[k], str4[k + 1]);
                }
                row--;
            }
        }
    }
 
/* displays the output */
    for (i = 0;i < row;i++)
    {
        printf("\n%s" , str4[i]);
    }
}

Output

 enter the string :welcome to Ictjobs.info's class
enter string:welcome to c programming class
 
welcomewelcome
welcometo
welcomec
welcomeprogramming
welcomeclass
towelcome
toto
toc
toprogramming
toclass
Ictjobs.info' swelcome
Ictjobs.info'sto
Ictjobs.info' sc
Ictjobs.info'sprogramming
Ictjobs.info' sclass
classwelcome
classto
classc
classprogramming
classclass
welcomeIctjobs.info's
toIctjobs.info' s
cwelcome
cto
cIctjobs.info's
cclass
programmingwelcome
programmingto
programmingIctjobs.info' s
programmingclass
classIctjobs.info's 

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