Program to concatenate of two strings without using strcat function

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#include<stdio.h>
#include<conio.h>
void main()
{
    char str1[50],str2[50];
    int i,j,n,k;
    clrscr();
    printf("\n Please Give The STRING OF A : ");
    scanf("%s",str1);
    printf("\n Please Give The STRING OF B : ");
    scanf("%s",str2);
    for(i=0,k=0;a[i]!='\0';i++)
        k++;
    for(j=0,n=0;b[j]!='\0';j++)
        n++;
    printf("VALUE OF K=%d",k);
    printf("VALUE OF N=%d",n);
    for(i=k,j=0;i<=n+k;i++,j++)
            str1[i]=str2[j];
    printf("\n THE Concatenated string is %s .",str1);
    getch();
}

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Please Give The STRING OF A : Mudasir
 Please Give The STRING OF B : Najar
VALUE OF K= 4VALUE OF N= 5

 THE Concatenated stringis MudsirNajar