length and concatenate and compare string in c

#include <stdio.h>
#include <string.h>
int main()
{
    char str1[50], str2[50];
    int str1Cntr=0, str2Cntr=0;
    int compare;

    printf("Enter a word1: ");
    scanf("%s",str1);
    printf("Enter a word2: ");
    scanf("%s",str2);
    //to get the legth of the strings
    str1Cntr = strlen(str1);
    str2Cntr = strlen(str2);

    //concatenate the two string using strcat
    strcat(str1,str2);

    // comparing both the strings using strcmp() function
    compare = strcmp(str1,str2);

    //display the legth of string 1 and 2
    printf("\nThe length of the first string is: %d", str1Cntr);
    printf("\nThe length of the second string is: %d", str2Cntr);
    //display concatenate the two string
    printf("\nConcatenated two String: %s\n", str1);
    //display if the string is equal
    if(compare==0) {
        printf("strings are equal");
    }
    else{
        printf("strings are not equal");
    }


    return 0;
}