Issue reading line and printing everything together in c - c

Question

I am trying to write a code that reads line by line and stores it in a variable sdp. This is what I would paste in the console to be read and I want the sdp to appear in that same format.
The idea would be to read every line, and put a end of line character and for every read reallocating extra memory.
Here is the code I wrote:
printf("[Description]: ");
char *line;
size_t len = 0;
ssize_t read = 0;
char *sdp = (char*) malloc(sizeof(char));
while ((read = getline(&line, &len, stdin)) != -1 && all_space(line)) {
sdp = (char*) realloc (sdp,(sizeof(sdp)) +sizeof(line));
strcat(sdp, line);
strcat(sdp, "\r\n");
free(line);
}
printf("%s\n",sdp);
rtcSetRemoteDescription(peer->pc, sdp, "offer");
free(sdp);
This is what I am trying to read and store in the variable sdp
v=0
o=- 118260718 0 IN IP4 127.0.0.1
s=-
t=0 0
a=group:BUNDLE 0
m=application 9 UDP/DTLS/SCTP webrtc-datachannel
c=IN IP4 0.0.0.0
a=ice-ufrag:r4nc
a=ice-pwd:USf61+k7dRjSFJFZIlZkNn
a=ice-options:trickle
a=mid:0
a=setup:actpass
a=dtls-id:1
a=fingerprint:sha-256 21:C5:F4:72:3C:BA:4F:4A:DD:F1:14:C5:15:A9:57:4E:5B:61:44:CB:9B:7C:FC:2A:D3:0D:90:99:47:53:A9:57
a=sctp-port:5000
a=max-message-size:262144
But i keeping getting a problem, sdp doesnot store all the value and the result after printing is strange.
can someone help me
2020-05-11 21:24:28.287 DEBUG [15263] [rtc::InitLogger#34] Logger initialized
Peer created
Reached this point
***************************************************************************************
* 0: Exit / 1: Enter remote description / 2: Enter remote candidate / 3: Send message / 4: Print Connection Info *
[Command]: v=0
o=- 118260718 0 IN IP4 127.0.0.1
s=-
t=0 0
a=group:BUNDLE 0
m=application 9 UDP/DTLS/SCTP webrtc-datachannel
c=IN IP4 0.0.0.0
a=ice-ufrag:r4nc
a=ice-pwd:USf61+k7dRjSFJFZIlZkNn
a=ice-options:trickle
a=mid:0
a=setup:actpass
a=dtls-id:1
a=fingerprint:sha-256 21:C5:F4:72:3C:BA:4F:4A:DD:F1:14:C5:15:A9:57:4E:5B:61:44:CB:9B:7C:FC:2A:D3:0D:90:99:47:53:A9:57
a=sctp-port:5000
a=max-message-size:262144user#user-MXC6300:~/Desktop/WEBRTC/build$ o=- 118260718 0 IN IP4 127.0.0.1
118260718: command not found
user#user-MXC6300:~/Desktop/WEBRTC/build$ s=-
user#user-MXC6300:~/Desktop/WEBRTC/build$ t=0 0
0: command not found
user#user-MXC6300:~/Desktop/WEBRTC/build$ a=group:BUNDLE 0
0: command not found
user#user-MXC6300:~/Desktop/WEBRTC/build$ m=application 9 UDP/DTLS/SCTP webrtc-datachannel
9: command not found
user#user-MXC6300:~/Desktop/WEBRTC/build$ c=IN IP4 0.0.0.0
IP4: command not found
user#user-MXC6300:~/Desktop/WEBRTC/build$ a=ice-ufrag:r4nc
user#user-MXC6300:~/Desktop/WEBRTC/build$ a=ice-pwd:USf61+k7dRjSFJFZIlZkNn
user#user-MXC6300:~/Desktop/WEBRTC/build$ a=ice-options:trickle
user#user-MXC6300:~/Desktop/WEBRTC/build$ a=mid:0
user#user-MXC6300:~/Desktop/WEBRTC/build$ a=setup:actpass
user#user-MXC6300:~/Desktop/WEBRTC/build$ a=dtls-id:1
user#user-MXC6300:~/Desktop/WEBRTC/build$ a=fingerprint:sha-256 21:C5:F4:72:3C:BA:4F:4A:DD:F1:14:C5:15:A9:57:4E:5B:61:44:CB:9B:7C:FC:2A:D3:0D:90:99:47:53:A9:57
21:C5:F4:72:3C:BA:4F:4A:DD:F1:14:C5:15:A9:57:4E:5B:61:44:CB:9B:7C:FC:2A:D3:0D:90:99:47:53:A9:57: command not found
user#user-MXC6300:~/Desktop/WEBRTC/build$ a=sctp-port:5000
user#user-MXC6300:~/Desktop/WEBRTC/build$ a=max-message-size:262144