/* If the message contains a string of the form:
TO: <Username>
then return 'Username' */
char* fetch_dest_user_string(char* message);

/* If the message contains a string of the form:
IAM: <Username>
then return 'Username' */
char* fetch_sender_user_string(char* message);

/* If the message contains a string of the form:
<Indicator>: <Value>
Then return 'value' */
char* fetch_generic_string(char* indicator, char* message);

/* If the message contains a string of the form:
START_OF_MESSAGE
<text>
END_OF_MESSAGE