String Concatenate Using Functions

#include<stdio.h>

int string_concatenate(int i,char a[],char b[])
{     
      int j=0;
     
      
 while( b[j]!='\0')   
      {
        a[i] = b[j];
        i++;
        j++;
    }
	    a[i]='\0';
            return a;
			
}

int string_length(char string[] )
{
  int p=0;
  while(string[p]!='\0')
  {
  	p++;
    
  } 
    return p;
}

void main()
{   

     char s1[100], s2[100];
    int l;
    printf("\n Please Enter the First String : ");
    gets(s1);
    printf("\n Please Enter the Second String : ");
    gets(s2);
    
    l=string_length(s1);
    printf("\nThe concatenated string is: ");  
    string_concatenate(l,s1,s2);
    puts(s1);
    
   }

     

           

Note: Need to be arranged in compiler after copied

   

 OutPut:

Please Enter the First String : Hii Please Enter the Second String : Hello The concatenated string is: HiiHello