Problem with encoding

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C

As I am using RSA for encryption and decryption in C language but in this case its working fine but the text given to encrypt its only encrypting the starting word not the full sentence which is given by user to encode.
EXAMPLE: Ram is a good boy
Encoded text: Rhq
Decoded text: Ram
unable to sort out the problem please help. The sample code is given below:

#include<stdio.h>
#include<conio.h>
#include<stdlib.h>
#include<math.h>
#include<string.h>

long int p,q,n,t,flag,e[100],d[100],temp[100],j,m[100],en[100],i;
char msg[100];
int prime(long int);
void ce();
long int cd(long int);
void encrypt();
void decrypt();
void main()
{
clrscr();
printf("\nENTER FIRST PRIME NUMBER\n");
scanf("%d",&q);
flag=prime(p);
if(flag==0)
{
    printf("\nWRONG INPUT\n");
    getch();
    exit(1);
}
printf("\nENTER ANOTHER PRIME NUMBER\n");
scanf("%d",&q);
flag=prime(q);
if(flag==0||p==q)
{
    printf("\nWRONG INPUT\n");
    getch();
    exit(1);
}
printf("\nENTER MESSAGE\n");
fflush(stdin);
scanf("%s",msg);
for(i=0;msg[i]!=NULL;i++)
m[i]=msg[i];
n=p*q;
t=(p-1)*(q-1);
ce();
printf("\nPOSSIBLE VALUES OF e AND d ARE\n");
for(i=0;i<j-1;i++)>
printf("\n%ld\t%ld",e[i],d[i]);
encrypt();
decrypt();
getch();
}
int prime(long int pr)
{
int i;
j=sqrt(pr);
for(i=2;i<=j;i++)
{
    if(pr%i==0)
    return 0;
}
return 1;
}
void ce()
{
int k;
k=0;
for(i=2;i<t;i++)>
{
    if(t%i==0)
    continue;
    flag=prime(i);
    if(flag==1&&i!=p&&i!=q)
    {
        e[k]=i;
        flag=cd(e[k]);
        if(flag>0)
        {
            d[k]=flag;
            k++;
        }
        if(k==99)
        break;
    }
}
}
long int cd(long int x)
{
long int k=1;
while(1)
{
    k=k+t;
    if(k%x==0)
    return(k/x);
}
}
void encrypt()
{
long int pt,ct,key=e[0],k,len;
i=0;
len=strlen(msg);
while(i!=len)
{
    pt=m[i];
    pt=pt-96;
    k=1;
    for(j=0;j<key;j++)>
    {
        k=k*pt;
        k=k%n;
    }
    temp[i]=k;
    ct=k+96;
    en[i]=ct;
    i++;
}
en[i]=-1;
printf("\nTHE ENCRYPTED MESSAGE IS\n");
for(i=0;en[i]!=-1;i++)
printf("%c",en[i]);
}
void decrypt()
{
long int pt,ct,key=d[0],k;
i=0;
while(en[i]!=-1)
{
    ct=temp[i];
    k=1;
    for(j=0;j<key;j++)>
    {
        k=k*ct;
        k=k%n;
    }
    pt=k+96;
    m[i]=pt;
    i++;
}
m[i]=-1;
printf("\nTHE DECRYPTED MESSAGE IS\n");
for(i=0;m[i]!=-1;i++)
printf("%c",m[i]);
}

Please help me out. Thank in advance...