Dynamic Memory Allocation Questions

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#include<stdio.h>
#include<stdlib.h>
#include<string.h>
typedef struct
{
char *name;
} Addr;
int main()
{
Addr *s;
char comm[10];
char *str = "Hello"; 
s = (Addr *)malloc(sizeof(Addr)); 
printf("Enter a name"); 
fgets(comm, 10,stdin);
s->name = (char*)malloc(sizeof(char[strlen(comm)]));
strcpy(s->name, comm); 
strcat(str,s->name); 
printf("%s", str);
}

// for the input: india

#define MAX 50 
int fun1()
{
char *s1;
s1=(char *) malloc (MAX*sizeof(char));
s1="hello";
printf("%d",s1);
free(s1);
}
int fun2() 
{
char *s;
s=(char *) malloc (MAX*sizeof(char));
strcpy(s,"hello");
printf("%d",s);
free(s);
}
int main ()
{
fun1();
fun2();
return 0;
}

#include<stdio.h>
#include<stdlib.h>
#include<string.h>
void main()
{
char *p = "Hello";
char *q = "world";
int l1 = strlen (p);
int l2 = strlen (q);
char *l = (char*) malloc (sizeof (l1 + l2)+1);
while (*p) *l++ = *p++;
while (*q) *l++ = *q++;
*l = '\0'; 
}

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